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((Short description|Type of musical scale and characteristic behaviors))
((About|modes as used in music|"modes" in statistics|Mode (statistics)|5=Mode (disambiguation)))
((Image frame
|content = <score sound="1">
    \relative c' {
        \clef treble \time 7/4 \hide Staff.TimeSignature
        c4 d e f g a b c2
    }
</score>
|width=|caption = Diatonic major scale ([[Ionian mode]], I) on C, a "white note" scale
))

((Image frame|content=<score sound="1">
{
\key c \dorian
\override Score.TimeSignature #'stencil = ##f
\relative c' { 
  \clef treble 
  \time 7/4 c4^\markup { Dorian mode, II, on C } d es f g a bes c
} }
</score>

<score sound="1">
{
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\key c \phrygian
\relative c' { 
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  \time 7/4 c4^\markup { Phrygian mode, III, on C } des es f g aes bes c
} }
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<score sound="1">
{
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\key c \lydian
\relative c' { 
  \clef treble 
  \time 7/4 c4^\markup { Lydian mode, IV, on C } d e fis g a b c
} }
</score>

<score sound="1">
{
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\key c \mixolydian
\relative c' { 
  \clef treble 
  \time 7/4 c4^\markup { Mixolydian mode, V, on C } d e f g a bes c
} }
</score>

<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\key c \aeolian
\relative c' { 
  \clef treble 
  \time 7/4 c4^\markup { Aeolian mode, VI, on C } d es f g aes bes c
} }
</score>

<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\key c \locrian
\relative c' { 
  \clef treble 
  \time 7/4 c4^\markup { Locrian mode, VII, on C } des es f ges aes bes c
} }
</score>|width=300|caption=The modern (diatonic) modes on C))

In [[music theory]], the term '''mode''' or '''''modus''''' is used in a number of distinct senses, depending on context.

Its most common use may be described as a type of [[Scale (music)|musical scale]] coupled with a set of characteristic melodic and harmonic behaviors. It is applied to [[major and minor]] keys as well as the seven [[diatonic mode]]s (including the former as [[Ionian mode|Ionian]] and [[Aeolian mode|Aeolian]]) which are defined by their starting note or tonic. ([[Olivier Messiaen]]'s [[modes of limited transposition]] are strictly a scale type.) Related to the diatonic modes are the eight '''church modes''' or [[Gregorian modes]], in which [[Gregorian mode#Tonality|authentic and plagal]] forms of scales are distinguished by [[Ambitus (music)|ambitus]] and [[tenor]] or [[reciting tone]]. Although both diatonic and Gregorian modes borrow terminology from [[ancient Greece]], the [[Musical system of ancient Greece|Greek ''tonoi'']] do not otherwise resemble their mediaeval/modern counterparts.

In the Middle Ages the term '''modus''' was used to describe both intervals<!-- room for expansion here --> and rhythm. [[Modal rhythm]] was an essential feature of the modal [[musical notation|notation system]] of the [[Notre-Dame school]] at the turn of the 12th century. In the [[mensural notation]] that emerged later, '''modus''' [[Mensural notation#Mensurations|specifies the subdivision]] of the [[longa (music)|''longa'']].

Outside of [[Western classical music]], "mode" is sometimes used to embrace similar concepts such as ''[[Octoechos]]'', ''[[Arabic maqam|maqam]]'', ''[[pathet]]'' etc. (see ((slink||Analogues in different musical traditions)) below).

== Mode as a general concept ==
Regarding the concept of mode as applied to pitch relationships generally, [[Harold Powers|Harold S. Powers]] proposed that "mode" has "a twofold sense", denoting either a "particularized scale" or a "generalized tune", or both. "If one thinks of scale and tune as representing the poles of a continuum of melodic predetermination, then most of the area between can be designated one way or the other as being in the domain of mode".<ref name="Powers-2001-§I,3">((harvp|Powers|2001|loc=§I,3))</ref>

In 1792, [[William Jones (philologist)|Sir Willam Jones]] applied the term "mode" to the music of "the [[Persians]] and the Hindoos".<ref>((harvp|Powers|2001|loc=§V,1))</ref> As early as 1271, Amerus applied the concept to ''cantilenis organicis'', i.e. most probably polyphony.<ref name="Powers-2001-§III,1">((harvp|Powers|2001|loc=§III,1))</ref> It is still heavily used with regard to Western [[polyphony]] before the onset of the [[Common practice (music)|common practice period]], as for example "modale Mehrstimmigkeit" by [[Carl Dahlhaus]]<ref>((harvp|Dahlhaus|1968|pp=174 et passim))</ref> or "Alte Tonarten" of the 16th and 17th centuries found by Bernhard Meier.<ref>((harvp|Meier|1974))</ref><ref>((harvp|Meier|1992))</ref>

The word encompasses several additional meanings. Authors from the 9th century until the early 18th century (e.g., [[Guido of Arezzo]]) sometimes employed the Latin ''modus'' for [[interval (music)|interval]],<ref name="Powers-2001-§1,2">((harvp|Powers|2001|loc=§1,2))</ref> or for qualities of individual notes.<ref>N. Meeùs, "''Modi vocum''. Réflections sur la théorie modale médiévale." ''Con-Scientia Musica. Contrapunti per Rossana Dalmonte e Mario Baroni'', A. R. Addessi e. a. ed., Lucca, Libreria Musicale Italiana, 2010, pp. 21-33</ref> In the theory of late-medieval [[Mensural notation|mensural]] polyphony (e.g., [[Franco of Cologne]]), ''modus'' is a rhythmic relationship between long and short values or a pattern made from them;<ref name=Powers-2001-Introduction>((harvp|Powers|2001|loc=Introduction))</ref> in mensural music most often theorists applied it to [[Modus (medieval music)|division of longa into 3 or 2 breves]].<ref>A. M. Busse Berger, "The Evolution of Rhythmic Notation", ''The Cambridge History of Western Music Theory'', Th. Christensen ed., Cambridge University Press 2002, pp. 628-656, particularly pp. 629-635</ref>

==Modes and scales==
A [[musical scale]] is a series of [[Pitch (music)|pitches]] in a distinct order.

The concept of "mode" in Western music theory has three successive stages: in [[Gregorian chant]] theory, in [[Renaissance music|Renaissance polyphonic theory]], and in tonal harmonic music of the common practice period. In all three contexts, "mode" incorporates the idea of the [[diatonic scale]], but differs from it by also involving an element of [[melody type]]. This concerns particular repertories of short musical [[Figure (music)|figures]] or groups of tones within a certain scale so that, depending on the point of view, mode takes on the meaning of either a "particularized scale" or a "generalized tune". Modern [[Musicology|musicological]] practice has extended the concept of mode to earlier musical systems, such as those of [[Ancient Greek music]], Jewish [[Hebrew cantillation|cantillation]], and the [[Byzantine music|Byzantine]] system of ''[[octoechos|octoechoi]]'', as well as to other non-Western types of music.<ref name="Powers-2001-§I,3" /><ref name="Winnington-Ingram-1936-2–3">((harvp|Winnington-Ingram|1936|pp=2–3))</ref>

By the early 19th century, the word "mode" had taken on an additional meaning, in reference to the difference between major and minor [[Key (music)|keys]], specified as "[[Major scale|major mode]]" and "[[Minor scale|minor mode]]". At the same time, composers were beginning to conceive "modality" as something outside of the major/minor system that could be used to evoke religious feelings or to suggest [[Folk music|folk-music]] idioms.<ref>((harvp|Porter|2001))</ref>

==Greek modes==
((Main|Musical system of ancient Greece))

Early Greek treatises describe three interrelated concepts that are related to the later, medieval idea of "mode": (1) [[musical scale|scales]] (or "systems"), (2) ''tonos'' – pl. ''tonoi'' – (the more usual term used in medieval theory for what later came to be called "mode"), and (3) ''harmonia'' (harmony) – pl. ''harmoniai'' – this third term subsuming the corresponding ''tonoi'' but not necessarily the converse.<ref name=Mathiesen-2001a-6iiie>((harvp|Mathiesen|2001a|loc=6(iii)(e)))</ref>

===Greek scales===
((Image frame|content=<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\relative c' { 
  \clef treble \time 4/4
  e4^\markup { Enharmonic genus } feh geses a b ceh deses e

} }
</score>

<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\relative c' { 
  \clef treble \time 4/4
  e4^\markup { Chromatic genus } f ges a b c des e

} }
</score>

<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\relative c' { 
  \clef treble \time 4/4
  e4^\markup { Diatonic genus } f g a b c d e
} }
</score>|width=300|caption=The three genera of the Dorian [[octave species]] on E))

The Greek scales in the [[Aristoxenus|Aristoxenian]] tradition were:<ref>((harvp|Barbera|1984|p=240))</ref><ref name=Mathiesen-2001a-6iiid>((harvp|Mathiesen|2001a|loc=6(iii)(d)))</ref>

* [[Mixolydian mode#Greek Mixolydian|Mixolydian]]: ''hypate hypaton–paramese'' (b–b′)
* [[Lydian mode|Lydian]]: ''parhypate hypaton–trite diezeugmenon'' (c′–c″)
* [[Phrygian mode#Ancient Greek Phrygian mode|Phrygian]]: ''lichanos hypaton–paranete diezeugmenon'' (d′–d″)
* [[Dorian mode|Dorian]]: ''hypate meson–nete diezeugmenon'' (e′–e″)
* [[Hypolydian mode|Hypolydian]]: ''parhypate meson–trite hyperbolaion'' (f′–f″)
* [[Hypophrygian mode|Hypophrygian]]: ''lichanos meson–paranete hyperbolaion'' (g′–g″)
* Common, [[Locrian mode|Locrian]], or [[Hypodorian mode|Hypodorian]]: ''mese–nete hyperbolaion'' or ''proslambnomenos–mese'' (a′–a″ or a–a′)

These names are derived from an ancient Greek subgroup ([[Dorians]]), a small region in central Greece ([[Locris]]), and certain neighboring peoples (non-Greek but related to them) from [[Asia Minor]] ([[Lydia]], [[Phrygia]]). The association of these ethnic names with the [[octave species]] appears to precede [[Aristoxenus]], who criticized their application to the ''tonoi'' by the earlier theorists whom he called the "Harmonicists." According to Bélis (2001), he felt that their diagrams, which exhibit 28 consecutive dieses, were "... devoid of any musical reality since more than two quarter-tones are never heard in succession."<ref>((harvp|Bélis|2001))</ref>

Depending on the positioning (spacing) of the interposed tones in the [[tetrachord]]s, three ''genera'' of the seven octave species can be recognized. The diatonic genus (composed of tones and semitones), the chromatic genus (semitones and a minor third), and the [[enharmonic genus]] (with a major third and two [[quarter tone]]s or [[diesis|dieses]]).<ref>((harvp|Cleonides|1965|pp=35–36))</ref> The framing interval of the perfect fourth is fixed, while the two internal pitches are movable. Within the basic forms, the intervals of the chromatic and diatonic genera were varied further by three and two "shades" (''chroai''), respectively.<ref>((harvp|Cleonides|1965|pp=39–40))</ref><ref>((harvp|Mathiesen|2001a|loc=6(iii)(c)))</ref>

In contrast to the medieval modal system, these scales and their related ''tonoi'' and ''harmoniai'' appear to have had no hierarchical relationships amongst the notes that could establish contrasting points of tension and rest, although the ''mese'' ("middle note") may have had some sort of gravitational function.<ref>((harvp|Palisca|2006|p=77))</ref>

===''Tonoi''===
The term ''tonos'' (pl. ''tonoi'') was used in four senses: "as note, interval, region of the voice, and pitch. We use it of the region of the voice whenever we speak of Dorian, or Phrygian, or Lydian, or any of the other tones".<ref name=Cleonides-1965-p44>((harvp|Cleonides|1965|p=44))</ref> [[Cleonides]] attributes thirteen ''tonoi'' to Aristoxenus, which represent a progressive [[Transposition (music)|transposition]] of the entire system (or scale) by semitone over the range of an octave between the Hypodorian and the Hypermixolydian.<ref name=Mathiesen-2001a-6iiie /> According to Cleonides, Aristoxenus's transpositional ''tonoi'' were named analogously to the octave species, supplemented with new terms to raise the number of degrees from seven to thirteen.<ref name=Cleonides-1965-p44 /> However, according to the interpretation of at least three modern authorities, in these transpositional ''tonoi'' the Hypodorian is the lowest, and the Mixolydian next-to-highest – the reverse of the case of the octave species,<ref name=Mathiesen-2001a-6iiie /><ref>((harvp|Solomon|1984|pp=244–245))</ref><ref>((harvp|West|1992|loc=((Page needed|date=March 2018))))</ref> with nominal base pitches as follows (descending order):
* F: Hypermixolydian (or Hyperphrygian)
* E: High Mixolydian or Hyperiastian
* E((music|flat)): Low Mixolydian or Hyperdorian
* D: Lydian
* C((music|sharp)): Low Lydian or Aeolian
* C: Phrygian
* B: Low Phrygian or Iastian
* B((music|flat)): Dorian
* A: Hypolydian
* G((music|sharp)): Low Hypolydian or Hypoaeolian
* G: Hypophrygian
* F((music|sharp)): Low Hypophrygian or Hypoiastian
* F: Hypodorian

[[Ptolemy]], in his ''Harmonics'', ii.3–11, construed the ''tonoi'' differently, presenting all seven octave species within a fixed octave, through chromatic inflection of the scale degrees (comparable to the modern conception of building all seven modal scales on a single tonic). In Ptolemy's system, therefore there are only seven ''tonoi''.<ref name=Mathiesen-2001a-6iiie /><ref>((harvp|Mathiesen|2001c))</ref> [[Pythagoras]] also construed the intervals arithmetically (if somewhat more rigorously, initially allowing for 1:1 = Unison, 2:1 = Octave, 3:2 = Fifth, 4:3 = Fourth and 5:4 = Major Third within the octave). In their diatonic genus, these ''tonoi'' and corresponding ''harmoniai'' correspond with the intervals of the familiar modern major and minor scales. See [[Pythagorean tuning]] and [[Pythagorean interval]].

===''Harmoniai''===
{| class="wikitable" align="right" style="text-align:center;"
|+''Harmoniai'' of the School of Eratocles ([[enharmonic genus]])
! Mixolydian
| ((1/4)) || ((1/4)) || 2 || ((1/4)) || ((1/4)) || 2 || 1
|-
! Lydian
| ((1/4)) || 2 || ((1/4)) || ((1/4)) || 2 || 1 || ((1/4))
|-
! Phrygian
| 2 || ((1/4)) || ((1/4)) || 2 || 1 || ((1/4)) || ((1/4))
|-
! Dorian
| ((1/4)) || ((1/4)) || 2 || 1 || ((1/4)) || ((1/4)) || 2
|-
! Hypolydian
| ((1/4)) || 2 || 1 || ((1/4)) || ((1/4)) || 2 || ((1/4))
|-
! Hypophrygian
| 2 || 1 || ((1/4)) || ((1/4)) || 2 || ((1/4)) || ((1/4))
|-
! Hypodorian
| 1 || ((1/4)) || ((1/4)) || 2 || ((1/4)) || ((1/4)) || 2
|}
In music theory the Greek word ''harmonia'' can signify the enharmonic genus of [[tetrachord]], the seven octave species, or a style of music associated with one of the ethnic types or the ''tonoi'' named by them.<ref>((harvp|Mathiesen|2001b))</ref>

Particularly in the earliest surviving writings, ''harmonia'' is regarded not as a scale, but as the epitome of the stylised singing of a particular district or people or occupation.<ref name="Winnington-Ingram-1936-2–3" /> When the late-6th-century poet [[Lasus of Hermione]] referred to the Aeolian ''harmonia'', for example, he was more likely thinking of a [[Melody type|melodic style]] characteristic of Greeks speaking the [[Aeolic Greek|Aeolic dialect]] than of a scale pattern.<ref name=Anderson-Mathiesen-2001>((harvp|Anderson and Mathiesen|2001))</ref> By the late 5th century BC, these regional types are being described in terms of differences in what is called ''harmonia'' – a word with several senses, but here referring to the pattern of intervals between the notes sounded by the strings of a [[Lyre|lyra]] or a [[Cithara|kithara]].

However, there is no reason to suppose that, at this time, these tuning patterns stood in any straightforward and organised relations to one another. It was only around the year 400 that attempts were made by a group of theorists known as the harmonicists to bring these ''harmoniai'' into a single system and to express them as orderly transformations of a single structure. Eratocles was the most prominent of the harmonicists, though his ideas are known only at second hand, through Aristoxenus, from whom we learn they represented the ''harmoniai'' as cyclic reorderings of a given series of intervals within the octave, producing seven [[octave species]]. We also learn that Eratocles confined his descriptions to the enharmonic genus.<ref>((harvp|Barker|1984–89|loc=2:14–15))</ref>

In the ''[[The Republic (Plato)|Republic]]'', [[Plato]] uses the term inclusively to encompass a particular type of scale, range and register, characteristic rhythmic pattern, textual subject, etc.<ref name=Mathiesen-2001a-6iiie /> He held that playing music in a particular ''harmonia'' would incline one towards specific behaviors associated with it, and suggested that soldiers should listen to music in Dorian or Phrygian ''harmoniai'' to help make them stronger but avoid music in Lydian, Mixolydian or Ionian ''harmoniai'', for fear of being softened. Plato believed that a change in the musical modes of the state would cause a wide-scale social revolution.<ref>((harvp|Plato|1902|loc=III.10–III.12 = 398C–403C))</ref>

The philosophical writings of Plato and [[Aristotle]] (c. 350 BC) include sections that describe the effect of different ''harmoniai'' on mood and character formation. For example, Aristotle stated in his ''[[Politics (Aristotle)|Politics]]'':<ref>((harvp|Aristotle|1895|loc=viii:1340a:40–1340b:5))</ref>

((Blockquote|But melodies themselves do contain imitations of character. This is perfectly clear, for the ''harmoniai'' have quite distinct natures from one another, so that those who hear them are differently affected and do not respond in the same way to each. To some, such as the one called Mixolydian, they respond with more grief and anxiety, to others, such as the relaxed ''harmoniai'', with more mellowness of mind, and to one another with a special degree of moderation and firmness, Dorian being apparently the only one of the ''harmoniai'' to have this effect, while Phrygian creates ecstatic excitement. These points have been well expressed by those who have thought deeply about this kind of education; for they cull the evidence for what they say from the facts themselves.<ref name=Barker-1984-89-1:175-176>((harvp|Barker|1984–89|loc=1:175–176))</ref>))

Aristotle continues by describing the effects of rhythm, and concludes about the combined effect of rhythm and ''harmonia'' (viii:1340b:10–13): ((blockquote|From all this it is clear that music is capable of creating a particular quality of character [ἦθος] in the soul, and if it can do that, it is plain that it should be made use of, and that the young should be educated in it.<ref name=Barker-1984-89-1:175-176 />))

The word ''[[ethos]]'' (ἦθος) in this context means "moral character", and Greek ethos theory concerns the ways that music can convey, foster, and even generate ethical states.<ref name=Anderson-Mathiesen-2001 />

===''Melos''===
Some treatises also describe "melic" composition (μελοποιΐα), "the employment of the materials subject to harmonic practice with due regard to the requirements of each of the subjects under consideration"<ref>((harvp|Cleonides|1965|p=35))</ref> – which, together with the scales, ''tonoi'', and ''harmoniai'' resemble elements found in medieval modal theory.<ref>((harvp|Mathiesen|2001a|loc=6(iii)))</ref> According to [[Aristides Quintilianus]], melic composition is subdivided into three classes: dithyrambic, nomic, and tragic.<ref>((harvp|Mathiesen|1983|loc=i.12))</ref> These parallel his three classes of rhythmic composition: systaltic, diastaltic and hesychastic. Each of these broad classes of melic composition may contain various subclasses, such as erotic, comic and panegyric, and any composition might be elevating (diastaltic), depressing (systaltic), or soothing (hesychastic).<ref>((harvp|Mathiesen|2001a|p=4))</ref>

According to [[Thomas J. Mathiesen]], music as a performing art was called ''melos'', which in its perfect form (μέλος τέλειον) comprised not only the melody and the text (including its elements of rhythm and diction) but also stylized dance movement. Melic and rhythmic composition (respectively, μελοποιΐα and ῥυθμοποιΐα) were the processes of selecting and applying the various components of melos and rhythm to create a complete work. According to Aristides Quintilianus:
((Blockquote|And we might fairly speak of perfect melos, for it is necessary that melody, rhythm and diction be considered so that the perfection of the song may be produced: in the case of melody, simply a certain sound; in the case of rhythm, a motion of sound; and in the case of diction, the meter. The things contingent to perfect melos are motion-both of sound and body-and also chronoi and the rhythms based on these.<ref>((harvp|Mathiesen|1983|p=75))</ref>))

==Western Church==
[[File:Boezio, De Institutione Musica - scale.jpg|thumb|Excerpt from [[Boethius]]' ''De musica'' depicting a [[Scale (music)|scale]]]]
[[Tonary|Tonaries]], lists of chant titles grouped by mode, appear in western sources around the turn of the 9th century. The influence of developments in Byzantium, from Jerusalem and Damascus, for instance the works of Saints [[John of Damascus]] (d. 749) and [[Cosmas of Maiuma|Cosmas of Maiouma]],<ref>((harvp|Nikodēmos ’Agioreitēs|1836|loc=1:32–33))</ref><ref>((harvp|Barton|2009))</ref> are still not fully understood. The eight-fold division of the Latin modal system, in a four-by-two matrix, was certainly of Eastern provenance, originating probably in Syria or even in Jerusalem, and was transmitted from Byzantine sources to Carolingian practice and theory during the 8th century. However, the earlier Greek model for the Carolingian system was probably ordered like the later Byzantine ''[[Octoechos|oktōēchos]]'', that is, with the four principal ([[Gregorian mode#Authentic mode|authentic]]) modes first, then the four [[Gregorian mode#Plagal mode|plagals]], whereas the Latin modes were always grouped the other way, with the authentics and plagals paired.<ref name="Powers-2001-§II.1.ii">((harvp|Powers|2001|loc=§II.1(ii)))</ref>

The 6th-century scholar [[Anicius Manlius Severinus Boethius|Boethius]] had translated Greek music theory treatises by [[Nicomachus]] and [[Ptolemy]] into Latin.<ref>((harvp|Powers|2001))</ref> Later authors created confusion by applying mode as described by Boethius to explain [[Plainsong|plainchant]] modes, which were a wholly different system.<ref>((harvp|Palisca|1984|p=222))</ref> In his ''De institutione musica'', book 4 chapter 15, Boethius, like his Hellenistic sources, twice used the term ''harmonia'' to describe what would likely correspond to the later notion of "mode", but also used the word "modus" – probably translating the Greek word τρόπος (''tropos''), which he also rendered as Latin ''tropus'' – in connection with the system of transpositions required to produce seven diatonic octave species,<ref>((harvp|Bower|1984|pp=253, 260–261))</ref> so the term was simply a means of describing transposition and had nothing to do with the [[church modes]].<ref>((harvp|Powers|2001|loc=§II.1(i)))</ref>

Later, 9th-century theorists applied Boethius's terms ''tropus'' and ''modus'' (along with "tonus") to the system of church modes. The treatise ''De Musica'' (or ''De harmonica institutione'') of [[Hucbald]] synthesized the three previously disparate strands of modal theory: chant theory, the Byzantine ''oktōēchos'' and Boethius's account of Hellenistic theory.<ref>((harvp|Powers|2001|loc=§II.2))</ref> The late-9th- and early 10th-century compilation known as the ''Alia musica'' imposed the seven octave transpositions, known as ''tropus'' and described by Boethius, onto the eight church modes,<ref>((harvp|Powers|2001|loc=§II.2(ii)))</ref> but its compilator also mentions the Greek (Byzantine) [[Echos|echoi]] translated by the Latin term ''sonus''. Thus, the names of the modes became associated with the eight church tones and their modal formulas – but this medieval interpretation does not fit the concept of the ancient Greek harmonics treatises. The modern understanding of mode does not reflect that it is made of different concepts that do not all fit.

[[File:JubilateDeoIntroit.jpg|thumb|400px|The [[introit]] ''Jubilate Deo'', from which [[Jubilate Sunday]] gets its name, is in Mode&nbsp;8.]]
According to Carolingian theorists the eight church modes, or [[Gregorian mode]]s, can be divided into four pairs, where each pair shares the "[[final (music)|final]]" note and the four notes above the final, but they have different intervals concerning the species of the fifth. If the octave is completed by adding three notes above the fifth, the mode is termed ''authentic'', but if the octave is completed by adding three notes below, it is called ''plagal'' (from Greek πλάγιος, "oblique, sideways"). Otherwise explained: if the melody moves mostly above the final, with an occasional cadence to the sub-final, the mode is authentic. Plagal modes shift range and also explore the fourth below the final as well as the fifth above. In both cases, the strict [[Ambitus (music)|ambitus]] of the mode is one octave. A melody that remains confined to the mode's ambitus is called "perfect"; if it falls short of it, "imperfect"; if it exceeds it, "superfluous"; and a melody that combines the ambituses of both the plagal and authentic is said to be in a "mixed mode".<ref>((harvp|Rockstro|1880|p=343))</ref>

Although the earlier (Greek) model for the Carolingian system was probably ordered like the Byzantine ''oktōēchos'', with the four authentic modes first, followed by the four plagals, the earliest extant sources for the Latin system are organized in four pairs of authentic and plagal modes sharing the same final: protus authentic/plagal, deuterus authentic/plagal, tritus authentic/plagal, and tetrardus authentic/plagal.<ref name="Powers-2001-§II.1.ii" />

Each mode has, in addition to its final, a "[[reciting tone]]", sometimes called the "dominant".<ref>((harvp|Apel|1969|p=166))</ref><ref>((harvp|Smith|1989|p=14))</ref> It is also sometimes called the "tenor", from Latin ''tenere'' "to hold", meaning the tone around which the melody principally centres.<ref>((harvp|Fallows|2001))</ref> The reciting tones of all authentic modes began a [[perfect fifth|fifth]] above the final, with those of the plagal modes a [[Mediant|third]] above. However, the reciting tones of modes 3, 4, and 8 rose one [[Steps and skips|step]] during the 10th and 11th centuries with 3 and 8 moving from B to C ([[half step]]) and that of 4 moving from G to A ([[whole step]]).<ref>((harvp|Hoppin|1978|p=67))</ref>

[[File:Gregorian chant.gif|thumb|300px|[[Kyrie]] "orbis factor", in mode 1 (Dorian) with B((Music|flat)) on scale-degree 6, descends from the reciting tone, A, to the final, D, and uses the ''[[Subtonic|subtonium]]'' (tone below the final).]]

After the reciting tone, every mode is distinguished by scale degrees called "mediant" and "participant". The mediant is named from its position between the final and reciting tone. In the authentic modes it is the third of the scale, unless that note should happen to be B, in which case C substitutes for it. In the plagal modes, its position is somewhat irregular. The participant is an auxiliary note, generally adjacent to the mediant in authentic modes and, in the plagal forms, coincident with the reciting tone of the corresponding authentic mode (some modes have a second participant).<ref name=Rockstro-1880-342>((harvp|Rockstro|1880|p=342))</ref>

Only one [[Accidental (music)|accidental]] is used commonly in [[Gregorian chant]] – B may be lowered by a half-step to B((music|flat)). This usually (but not always) occurs in modes V and VI, as well as in the upper [[tetrachord]] of IV, and is optional in other modes except III, VII and VIII.<ref>((harvp|Powers|2001|loc=§II.3.i(b), Ex. 5))</ref>

{| class="wikitable"
|-
!Mode || I ([[Dorian mode|Dorian]]) || II ([[Hypodorian mode|Hypodorian]]) || III ([[Phrygian mode|Phrygian]]) || IV ([[Hypophrygian mode|Hypophrygian]]) || V ([[Lydian mode|Lydian]]) || VI ([[Hypolydian mode|Hypolydian]]) || VII ([[Mixolydian mode|Mixolydian]]) || VIII ([[Hypomixolydian mode|Hypomixolydian]])
|-
!Final
|D (re)||D (re)||E (mi)||E (mi)||F (fa)||F (fa)||G (sol)||G (sol)
|-
!Dominant
|A (la)||F (fa)||B (si) or C (do)||G (sol) or A (la)||C (do)||A (la)||D (re)||B (si) or C (do)
|}

In 1547, the Swiss theorist [[Heinrich Glarean|Henricus Glareanus]] published the ''Dodecachordon'', in which he solidified the concept of the church modes, and added four additional modes: the Aeolian (mode 9), [[Hypoaeolian mode|Hypoaeolian]] (mode 10), [[Ionian mode|Ionian]] (mode 11), and Hypoionian (mode 12). A little later in the century, the Italian [[Gioseffo Zarlino]] at first adopted Glarean's system in 1558, but later (1571 and 1573) revised the numbering and naming conventions in a manner he deemed more logical, resulting in the widespread promulgation of two conflicting systems.

Zarlino's system reassigned the six pairs of authentic–plagal mode numbers to finals in the order of the natural hexachord, C–D–E–F–G–A, and transferred the Greek names as well, so that modes 1 through 8 now became C-authentic to F-plagal, and were now called by the names Dorian to Hypomixolydian. The pair of G modes were numbered 9 and 10 and were named Ionian and Hypoionian, while the pair of A modes retained both the numbers and names (11, Aeolian, and 12 Hypoaeolian) of Glarean's system. While Zarlino's system became popular in France, Italian composers preferred Glarean's scheme because it retained the traditional eight modes, while expanding them. [[Luzzasco Luzzaschi]] was an exception in Italy, in that he used Zarlino's new system.<ref name="Powers-2001-§III.4.ii.a">((harvp|Powers|2001|loc=§III.4(ii)(a)))</ref><ref>((harvp|Powers|2001|loc=§III.4(iii)))</ref><ref>((harvp|Powers|2001|loc=§III.5(i & ii)))</ref>

In the late-18th and 19th centuries, some chant reformers (notably the editors of the [[Mechelen|Mechlin]], [[Pustet]]-Ratisbon ([[Regensburg]]), and [[Rheims]]-[[Cambrai]] Office-Books, collectively referred to as the [[Cecilian Movement]]) renumbered the modes once again, this time retaining the original eight mode numbers and Glareanus's modes 9 and 10, but assigning numbers 11 and 12 to the modes on the final B, which they named Locrian and Hypolocrian (even while rejecting their use in chant). The Ionian and Hypoionian modes (on C) become in this system modes 13 and 14.<ref name=Rockstro-1880-342 />

Given the confusion between ancient, medieval, and modern terminology, "today it is more consistent and practical to use the traditional designation of the modes with numbers one to eight",<ref>((harvp|Curtis|1997|p=256))</ref> using [[Roman numeral]] (I–VIII), rather than using the pseudo-Greek naming system. Medieval terms, first used in Carolingian treatises, later in Aquitanian tonaries, are still used by scholars today: the Greek ordinals ("first", "second", etc.) transliterated into the Latin alphabet protus (πρῶτος), deuterus (δεύτερος), tritus (τρίτος), and tetrardus (τέταρτος). In practice they can be specified as authentic or as plagal like "protus authentus / plagalis".

<!--this image displayed wider than 400px for clarity-->
[[File:The eight musical modes.png|600px|thumb|center|The eight musical modes. '''f''' indicates "final".<ref name=Curtis-1997-p255>((harvp|Curtis|1997|p=255))</ref>]]

===Use===
A mode indicated a primary pitch (a final), the organization of pitches in relation to the final, the suggested range, the [[melodic formula]]s associated with different modes, the location and importance of [[cadence]]s, and the affect (i.e., emotional effect/character). Liane Curtis writes that "Modes should not be equated with scales: principles of melodic organization, placement of cadences, and emotional affect are essential parts of modal content" in Medieval and Renaissance music.<ref name=Curtis-1997-p255 />

[[Carl Dahlhaus|Dahlhaus]] lists "three factors that form the respective starting points for the modal theories of [[Aurelian of Réôme]], [[Hermannus Contractus]], and [[Guido of Arezzo]]":<ref name=Dahlhaus-1990-pp191-192>((harvp|Dahlhaus|1990|pp=191–192))</ref>
* the relation of modal formulas to the comprehensive system of tonal relationships embodied in the diatonic scale
* the [[Octave species|partitioning of the octave]] into a modal framework
* the function of the modal final as a relational center.
The oldest medieval treatise regarding modes is ''Musica disciplina'' by [[Aurelian of Réôme]] (dating from around 850) while Hermannus Contractus was the first to define modes as partitionings of the octave.<ref name=Dahlhaus-1990-pp191-192 /> However, the earliest Western source using the system of eight modes is the Tonary of St Riquier, dated between about 795 and 800.<ref name="Powers-2001-§II.1.ii" />

Various interpretations of the "character" imparted by the different modes have been suggested. Three such interpretations, from [[Guido of Arezzo]] (995–1050), [[Adam of Fulda]] (1445–1505), and [[Juan de Espinosa Medrano]] (1632–1688), follow:((Citation needed|reason=What are the primary sources?|date=November 2020))

{| class="wikitable"
|-
!Name||Mode||D'Arezzo ||Fulda||Espinosa||Example chant
|-
!Dorian
|I||serious||any feeling||happy, taming the passions||[[File:Venisancte.ogg]] ''Veni sancte spiritus''
|-
!Hypodorian
|II||sad||sad||serious and tearful||[[File:Iesudulcis.ogg]] ''Iesu dulcis amor meus''
|-
!Phrygian
|III||mystic||vehement||inciting anger||[[File:Kyrie.ogg]] ''Kyrie, fons bonitatis''
|-
!Hypophrygian
|IV||harmonious||tender||inciting delights, tempering fierceness||[[File:Conditor.ogg]] ''Conditor alme siderum''
|-
!Lydian
|V||happy||happy||happy||[[File:Salve.ogg]] ''Salve Regina''
|-
!Hypolydian
|VI||devout||pious||tearful and pious||[[File:Ubicaritas.ogg]] ''Ubi caritas''
|-
!Mixolydian
|VII||angelical||of youth||uniting pleasure and sadness||[[File:Introibo.ogg]] ''Introibo''
|-
!Hypomixolydian
|VIII||perfect||of knowledge||very happy||[[File:Adcenam.ogg]] ''Ad cenam agni providi''
|}
<!--*All odd-numbered modes are authentic as for each mode the fourth and fifth are above the final.
*All even-numbered modes are plagal as for each mode the fourth is below the final.

In addition to the final each mode has a cofinal (confinal), which is the fifth (above) for authentic modes and the third below for plagal modes.<ref name=Curtis-1997-p255 />-->

==Modern modes==

Modern Western modes use the same set of notes as the [[major scale]], in the same order, but starting from one of its seven [[Degree (music)|degrees]] in turn as a [[Tonic (music)|tonic]], and so present a different sequence of [[Whole step|whole]] and [[half step]]s. With the interval sequence of the major scale being W–W–H–W–W–W–H, where "W" means a whole tone (whole step) and "H" means a semitone (half step), it is thus possible to generate the following modes:<ref>((harvp|Levine|1995|loc=Figure 2-4))</ref>

{| class="wikitable"
! Mode
! Tonic relative<br>to [[major scale]]
! [[Interval (music)|Interval]] sequence
! Example
|-
| [[Ionian mode|Ionian]]
| I
| align="center" | W–W–H–W–W–W–H
| C–D–E–F–G–A–B–C
|-
| [[Dorian mode|Dorian]]
| ii
| align="center" | W–H–W–W–W–H–W
| D–E–F–G–A–B–C–D
|-
| [[Phrygian mode|Phrygian]]
| iii
| align="center" | H–W–W–W–H–W–W
| E–F–G–A–B–C–D–E
|-
| [[Lydian mode|Lydian]]
| IV
| align="center" | W–W–W–H–W–W–H
| F–G–A–B–C–D–E–F
|-
| [[Mixolydian mode|Mixolydian]]
| V
| align="center" | W–W–H–W–W–H–W
| G–A–B–C–D–E–F–G
|-
| [[Aeolian mode|Aeolian]]
| vi
| align="center" | W–H–W–W–H–W–W
| A–B–C–D–E–F–G–A
|-
| [[Locrian mode|Locrian]]
| vii<sup>ø</sup>
| align="center" | H–W–W–H–W–W–W
| B–C–D–E–F–G–A–B
|}

For the sake of simplicity, the examples shown above are formed by [[natural note]]s (also called "white notes", as they can be played using the white keys of a [[piano keyboard]]). However, any [[Transposition (music)|transposition]] of each of these scales is a valid example of the corresponding mode. In other words, transposition preserves mode.<ref>((harvp|Boyden|1994|p=8))</ref>

[[File:Modal Interval Sequence.png|thumb|center|700px|Interval sequences for each of the modern modes, showing the relationship between the modes as a shifted grid of intervals.]]

Although the names of the modern modes are Greek and some have names used in ancient Greek theory for some of the ''harmoniai'', the names of the modern modes are conventional and do not refer to the sequences of intervals found even in the diatonic genus of the Greek [[octave species]] sharing the same name.<ref>((cite encyclopedia| url = https://www.britannica.com/art/mode-music | title = Mode | first = Mieczyslaw | last = Kolinski | date = September 9, 2010|encyclopedia=[[Encyclopædia Britannica]]| access-date = November 13, 2020))</ref>

===Analysis===
((Unreferenced section|date=January 2020))
Each mode has characteristic intervals and chords that give it its distinctive sound. The following is an analysis of each of the seven modern modes. The examples are provided in a key signature with no sharps or flats (scales composed of [[natural note]]s).

====Ionian (I)====
The [[Ionian mode]] is the modern [[major scale]]. The example composed of natural notes begins on C, and is also known as the [[C-major]] scale:
((Image frame|content=<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\relative c' { 
  \clef treble 
  \time 7/4 c4 d e f g a b c
} }
</score>|width=300|caption=The modern [[Ionian mode]] on C))

{| class="wikitable"
|-
! [[Natural note]]s
| C || D || E || F || G || A || B || C
|-
! [[Interval (music)|Interval]] from C
| P1 || M2 || M3 || P4 || P5 || M6 || M7 || P8
|}

*'''Tonic [[triad (music)|triad]]''': C major
*'''Tonic [[seventh chord]]''': C<sup>M7</sup>
*'''Dominant triad''': G (in modern tonal thinking, the fifth or dominant [[Degree (music)|scale degree]], which in this case is G, is the next-most important [[Root (chord)|chord root]] after the tonic)
*'''Seventh chord on the dominant''': G<sup>7</sup> (a [[dominant seventh chord]], so-called because of its position in this – and only this – modal scale)

====Dorian (II)====
The [[Dorian mode]] is the second mode. The example composed of natural notes begins on D:
((Image frame|content=<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\relative c' { 
  \clef treble 
  \time 7/4 d4 e f g a b c d
} }
</score>|width=300|caption=The modern [[Dorian mode]] on D))

{| class="wikitable"
|-
! [[Natural note]]s
| D || E || F || G || A || B || C || D
|-
! [[Interval (music)|Interval]] from D
| P1 || M2 || m3 || P4 || P5 || M6 || m7 || P8
|}
The Dorian mode is very similar to the modern [[natural minor scale]] (see Aeolian mode below). The only difference with respect to the natural minor scale is in the sixth [[Degree (music)|scale degree]], which is a major sixth (M6) above the tonic, rather than a minor sixth (m6).

*'''Tonic triad''': Dm
*'''Tonic seventh chord''': Dm<sup>7</sup>
*'''Dominant triad''': Am
*'''Seventh chord on the dominant''': Am<sup>7</sup> (a [[minor seventh chord]])

====Phrygian (III)====
The [[Phrygian mode]] is the third mode. The example composed of natural notes starts on E:
((Image frame|content=<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\relative c' { 
  \clef treble 
  \time 7/4 e4 f g a b c d e
} }
</score>|width=300|caption=The modern [[Phrygian mode]] on E))

{| class="wikitable"
|-
! [[Natural note]]s
| E || F || G || A || B || C || D || E
|-
! [[Interval (music)|Interval]] from E
| P1 || m2 || m3 || P4 || P5 || m6 || m7 || P8
|}

The Phrygian mode is very similar to the modern [[natural minor scale]] (see Aeolian mode below). The only difference with respect to the natural minor scale is in the second [[Degree (music)|scale degree]], which is a minor second (m2) above the tonic, rather than a major second (M2).

*'''Tonic triad''': Em
*'''Tonic seventh chord''': Em<sup>7</sup>
*'''Dominant triad''': Bdim
*'''Seventh chord on the dominant''': B<sup>ø7</sup> (a [[half-diminished seventh chord]])

====Lydian (IV)====
The [[Lydian mode]] is the fourth mode. The example composed of natural notes starts on F:
((Image frame|content=<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\relative c' { 
  \clef treble 
  \time 7/4 f4 g a b c d e f
} }
</score>|width=300|caption=The modern [[Lydian mode]] on F))

{| class="wikitable"
|-
! [[Natural note]]s
| F || G || A || B || C || D || E || F
|-
! [[Interval (music)|Interval]] from F
| P1 || M2 || M3 || A4 || P5 || M6 || M7 || P8
|}

The single tone that differentiates this scale from the [[major scale]] (Ionian mode) is its fourth [[Degree (music)|degree]], which is an augmented fourth (A4) above the tonic (F), rather than a perfect fourth (P4).

*'''Tonic triad''': F
*'''Tonic seventh chord''': F<sup>M7</sup>
*'''Dominant triad''': C
*'''Seventh chord on the dominant''': C<sup>M7</sup> (a [[major seventh chord]])

====Mixolydian (V)====
The [[Mixolydian mode]] is the fifth mode. The example composed of natural notes begins on G:
((Image frame|content=<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\relative c'' { 
  \clef treble 
  \time 7/4 g4 a b c d e f g
} }
</score>|width=300|caption=The modern [[Mixolydian mode]] on G))

{| class="wikitable"
|-
! [[Natural note]]s
| G || A || B || C || D || E || F || G
|-
! [[Interval (music)|Interval]] from G
| P1 || M2 || M3 || P4 || P5 || M6 || m7 || P8
|}

The single tone that differentiates this scale from the major scale (Ionian mode) is its seventh degree, which is a minor seventh (m7) above the tonic (G), rather than a major seventh (M7). Therefore, the seventh scale degree becomes a [[subtonic]] to the tonic because it is now a whole tone lower than the tonic, in contrast to the seventh degree in the major scale, which is a semitone tone lower than the tonic ([[leading-tone]]).

*'''Tonic triad''': G
*'''Tonic seventh chord''': G<sup>7</sup> (the dominant seventh chord in this mode is the seventh chord built on the tonic degree)
*'''Dominant triad''': Dm
*'''Seventh chord on the dominant''': Dm<sup>7</sup> (a minor seventh chord)

====Aeolian (VI)====
The [[Aeolian mode]] is the sixth mode. It is also called the [[natural minor scale]]. The example composed of natural notes begins on A, and is also known as the [[A minor|A natural-minor]] scale:

((Image frame|content=<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\relative c'' { 
  \clef treble 
  \time 7/4 a4 b c d e f g a
} }
</score>|width=300|caption=The modern [[Aeolian mode]] on A))

{| class="wikitable"

|-
! [[Natural note]]s
| A || B || C || D || E || F || G || A
|-
! [[Interval (music)|Interval]] from A
| P1 || M2 || m3 || P4 || P5 || m6 || m7 || P8
|}

*'''Tonic triad''': Am
*'''Tonic seventh chord''': Am<sup>7</sup>
*'''Dominant triad''': Em
*'''Seventh chord on the dominant''': Em<sup>7</sup> (a minor seventh chord)

====Locrian (VII)====
The [[Locrian mode]] is the seventh mode. The example composed of natural notes begins on B:
((Image frame|content=<score sound="1">
{
\override Score.TimeSignature #'stencil = ##f
\relative c'' { 
  \clef treble 
  \time 7/4 b4c d e f g a b
} }
</score>|width=300|caption=The modern [[Locrian mode]] on B))

{| class="wikitable"
|-
! [[Natural note]]s
| B || C || D || E || F || G || A || B
|-
! [[Interval (music)|Interval]] from B
| P1 || m2 || m3 || P4 || d5 || m6 || m7 || P8
|}

The distinctive [[Degree (music)|scale degree]] here is the diminished fifth (d5). This makes the tonic triad diminished, so this mode is the only one in which the chords built on the tonic and dominant scale degrees have their roots separated by a diminished, rather than perfect, fifth. Similarly the tonic seventh chord is half-diminished.
*'''Tonic triad''': Bdim or B°
*'''Tonic seventh chord''': Bm<sup>7((Music|flat))5</sup> or B<sup>ø7</sup>
*'''Dominant triad''': F
*'''Seventh chord on the dominant''': FM<sup>7</sup> (a major seventh chord)

=== Summary ===
The modes can be arranged in the following sequence, which follows the [[circle of fifths]]. In this sequence, each mode has one more lowered interval relative to the tonic than the mode preceding it. Thus, taking Lydian as reference, Ionian (major) has a lowered fourth; Mixolydian, a lowered fourth and seventh; Dorian, a lowered fourth, seventh, and third; Aeolian (natural minor), a lowered fourth, seventh, third, and sixth; Phrygian, a lowered fourth, seventh, third, sixth, and second; and Locrian, a lowered fourth, seventh, third, sixth, second, and fifth. Put another way, the augmented fourth of the Lydian mode has been reduced to a perfect fourth in Ionian, the major seventh in Ionian to a minor seventh in Mixolydian, etc.((Citation needed|date=January 2020|reason=This system differs significantly from the one given in the "Analysis" section, above. Neither system is cited.))

{| class="wikitable" style="text-align: center"
! rowspan="2"| Mode || rowspan="2"| White<br />note || colspan="8" | [[Interval (music)|Intervals]] with respect to the tonic
|-
! style="width: 5em"| unison
! style="width: 5em"| second
! style="width: 5em"| third
! style="width: 5em"| fourth
! style="width: 5em"| fifth
! style="width: 5em"| sixth
! style="width: 5em"| seventh
! style="width: 5em"| octave
|-
! style="text-align: left"| Lydian
| F
| rowspan="7"| perfect
| rowspan="5"| major
| rowspan="3"| major
| rowspan="1"| augmented
| rowspan="6"| perfect
| rowspan="4"| major
| rowspan="2"| major
| rowspan="7"| perfect
|-
! style="text-align: left"| Ionian
| C || rowspan="6" | perfect
|-
! style="text-align: left"| Mixolydian
| G || rowspan="5" | minor
|-
! style="text-align: left"| Dorian
| D || rowspan="4" | minor
|-
! style="text-align: left"| Aeolian
| A || rowspan="3" | minor
|-
! style="text-align: left"| Phrygian
| E || rowspan="2" | minor
|-
! style="text-align: left"| Locrian
| B || rowspan="1" | diminished
|}

The first three modes are sometimes called major,<ref>((harvp|Carroll|2002|p=134))</ref><ref name=Marx-1852-336 /><ref>((harvp|Marx|1852|pp=338, 342, 346))</ref><ref name=Serna-2013-35>((harvp|Serna|2013|p=35))</ref> the next three minor,<ref>((harvp|Carroll|2002|p=153))</ref><ref name=Marx-1852-336>((harvp|Marx|1852|p=336))</ref><ref name=Serna-2013-35 /> and the last one diminished (Locrian),<ref>((cite web
|url= https://www.musical-u.com/learn/the-aural-illusions-of-the-locrian-mode/#
|title= The Aural Illusions of the Locrian Mode
|last= Voitinskaia
|first= Anastasia
|website= Musical U
|date= 9 December 2018
|access-date= 2022-09-04
|quote=))</ref> according to the quality of their [[Tonic (music)|tonic]] [[Triad (music)|triads]]. The Locrian mode is traditionally considered theoretical rather than practical because the triad built on the first scale degree is diminished. Because [[diminished triad]]s are not consonant they do not lend themselves to [[Cadence (music)|cadential endings]] and cannot be tonicized according to traditional practice.

* The Ionian mode corresponds to the major scale. Scales in the Lydian mode are major scales with an [[augmented fourth]]. The Mixolydian mode corresponds to the major scale with a [[minor seventh]].
* The Aeolian mode is identical to the [[Minor scale#Natural minor scale|natural minor scale]]. The Dorian mode corresponds to the natural minor scale with a [[major sixth]]. The Phrygian mode corresponds to the natural minor scale with a [[minor second]].
* The Locrian is neither a major nor a minor mode because, although its third scale degree is minor, the fifth degree is diminished instead of perfect. For this reason it is sometimes called a "diminished" scale, though in jazz theory this term is also applied to the [[octatonic scale]]. This interval is [[enharmonic]]ally equivalent to the augmented fourth found between scale degrees 1 and 4 in the Lydian mode and is also referred to as the [[tritone]].

===Use===
Use and conception of modes or modality today is different from that in early music. As Jim Samson explains, "Clearly any comparison of medieval and modern modality would recognize that the latter takes place against a background of some three centuries of harmonic tonality, permitting, and in the 19th century requiring, a dialogue between modal and diatonic procedure".<ref>((harvp|Samson|1977|p=148))</ref> Indeed, when 19th-century composers revived the modes, they rendered them more strictly than Renaissance composers had, to make their qualities distinct from the prevailing major-minor system. Renaissance composers routinely sharped leading tones at cadences and lowered the fourth in the Lydian mode.<ref>((harvp|Carver|2005|loc=74n4))</ref>

The Ionian, or Iastian,<ref>((harvp|Anon.|1896))</ref><ref>((harvp|Chafe|1992|pp=23, 41, 43, 48))</ref><ref>((harvp|Glareanus|1965|p=153))</ref><ref>((harvp|Hiley|2002|loc=§2(b)))</ref><ref name="Powers-2001-§III.4.ii.a" /><ref>((harvp|Pratt|1907|p=67))</ref><ref>((harvp|Taylor|1876|p=419))</ref><ref>((harvp|Wiering|1995|p=25))</ref> mode is another name for the [[major scale]] used in much Western music. The Aeolian forms the base of the most common Western minor scale; in modern practice the Aeolian mode is differentiated from the minor by using only the seven notes of the Aeolian mode. By contrast, minor mode compositions of the [[common practice period]] frequently raise the seventh scale degree by a semitone to strengthen the [[Cadence (music)|cadences]], and in conjunction also raise the sixth scale degree by a semitone to avoid the awkward interval of an augmented second. This is particularly true of vocal music.<ref>((harvp|Jones|1974|p=33))</ref>

Traditional folk music provides countless examples of modal melodies. For example, [[Folk music of Ireland|Irish traditional music]] makes extensive usage not only of the major and minor (Aeolian) modes, but also the Mixolydian and Dorian modes. Within the context of Irish traditional music, the tunes are most commonly played in the keys of G-Major/A-Dorian/D-Mixolydian/E-Aeolian (minor) and D-Major/E-Dorian/A-Mixolydian/B-Aeolian (minor). Some Irish music is written in A-Major/F#-Aeolian (minor), with B-Dorian and E-Mixolydian tunes not being completely unheard of. Rarer still are Irish tunes in E-Major/F#-Dorian/B-Mixolydian. 

In some regions of Ireland, such as the west-central coast area of counties [[County Galway|Galway]] and [[County Clare|Clare]], “flat” keys are far more prevalent than in other areas. Instruments will be constructed or pitched accordingly to allow for modal playing in C-Major/D-Dorian/G-Mixolydian or F-Major/G-Dorian/C-Mixolydian/D-Aeolian (minor), with some rare exceptions in Eb-Major/C-minor being played regionally. Some tunes are even composed in Bb-Major, with modulating sections in F-Mixolydian. Interestingly, A-minor is less popularly played in the region, despite the localised prevalence of tunes in C-Major and related modes.<ref>((harvp|Cooper|1995|pp=9–20))</ref> Much [[Flamenco]] music is in the Phrygian mode, though frequently with the third and seventh degrees raised by a semitone.<ref>((harvp|Gómez, Díaz-Báñez, Gómez, and Mora|2014|pp=121, 123))</ref>

[[Zoltán Kodály]], [[Gustav Holst]], and [[Manuel de Falla]] use modal elements as modifications of a [[Diatonic and chromatic|diatonic]] background, while modality replaces diatonic [[tonality]] in the music of [[Claude Debussy]] and [[Béla Bartók]].<ref>((harvp|Samson|1977|loc=((Page needed|date=October 2009))))</ref>

==Other types==
While the term "mode" is still most commonly understood to refer to Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, or Locrian modes, in modern music theory the word is often applied to scales other than the diatonic. This is seen, for example, in [[minor scale|melodic minor]] scale harmony, which is based on the seven rotations of the ascending melodic minor scale, yielding some interesting scales as shown below. The "chord" row lists [[Tetrad (music)|tetrads]] that can be built from the pitches in the given mode<ref>((harvp|Levine|1995|pp=55–77))</ref> (in [[Chord names and symbols (popular music)|jazz notation]], the symbol Δ is for a [[major seventh]]).

{| class="wikitable"
|-
!Mode||I||II||III||IV||V||VI||VII
|-
!Name
|[[Ascending melodic minor scale|Ascending melodic minor]]||[[Dorian ♭2 scale|Dorian ((music|flat))2]] or<br />Phrygian ((music|#))6||[[Lydian augmented scale|Lydian augmented]]||[[Acoustic scale|Acoustic]]||[[Aeolian dominant scale|Aeolian dominant]] or Mixolydian ((music|flat))6||[[Half-diminished scale|Half-diminished]]||[[Altered scale|Altered]]
|-
!Notes
|1 2 ((music|flat))3 4 5 6 7||((nowrap|1 ((music|flat))2 ((music|flat))3 4 5 6 ((music|flat))7))||1 2 3 ((music|sharp))4 ((music|sharp))5 6 7||1 2 3 ((music|sharp))4 5 6 ((music|flat))7||1 2 3 4 5 ((music|flat))6 ((music|flat))7||1 2 ((music|flat))3 4 ((music|flat))5 ((music|flat))6 ((music|flat))7||1 ((music|flat))2 ((music|flat))3 ((music|flat))4 ((music|flat))5 ((music|flat))6 ((music|flat))7
|-
!Chord
|C–<sup>((music|major))</sup>||D–<sup>7</sup>||E((music|flat))<sup>((music|major))((music|sharp))5</sup>||F<sup>7((music|sharp))11</sup>||G<sup>7((music|flat))6</sup>||A((music|halfdim))||B<sup>7alt</sup>
|}

{| class="wikitable"
|-
!Mode||I||II||III||IV||V||VI||VII
|-
!Name
|[[Harmonic minor]]||Locrian ((music|#))6||Ionian ((music|sharp))5||[[Ukrainian Dorian scale|Ukrainian Dorian]]||[[Phrygian dominant scale|Phrygian Dominant]]||Lydian ((music|sharp))2||Altered Diminished
|-
!Notes
|1 2 ((music|flat))3 4 5 ((music|flat))6 7||((nowrap|1 ((music|flat))2 ((music|flat))3 4 ((music|flat))5 6 ((music|flat))7))||((nowrap|1 2 3 4 ((music|sharp))5 6 7))||1 2 ((music|flat))3 ((music|sharp))4 5 6 ((music|flat))7||1 ((music|flat))2 3 4 5 ((music|flat))6 ((music|flat))7||((nowrap|1 ((music|sharp))2 3 ((music|sharp))4 5 6 7))||1 ((music|flat))2 ((music|flat))3 ((music|flat))4 ((music|flat))5 ((music|flat))6 ((music|bb))7
|-
!Chord
|C–<sup>((music|major))</sup>||D((music|halfdim))||E((music|flat))<sup>((music|major))((music|sharp))5</sup>||F–<sup>7</sup>||G<sup>7((music|flat))9</sup>||A((music|flat))<sup>((music|major))</sup> or A((music|flat))–<sup>((music|major))</sup>||B((music|dim))<sup>7</sup>
|}

{| class="wikitable"
|-
!Mode||I||II||III||IV||V||VI||VII
|-
!Name
|[[Harmonic major scale|Harmonic major]]||Dorian ♭5 or Locrian ((music|#))2 ((music|#))6
|Phrygian ♭4 or Altered Dominant ((music|#))5||Lydian ♭3 or <!-- this covers the ascending melodic minor with a major 6th and major 7th --> Melodic Minor ((music|#))4||Mixolydian ♭2||Lydian Augmented ♯2||Locrian ((music|bb))7
|-
!Notes
|1 2 3 4 5 ((music|flat))6 7||((nowrap|1 2 ((music|flat))3 4 ((music|flat))5 6 ((music|flat))7))||1 ((music|flat))2 ((music|flat))3 ((music|flat))4 5 ((music|flat))6 ((music|flat))7||1 2 ((music|flat))3 ((music|sharp))4 5 6 7||1 ((music|flat))2 3 4 5 6 ((music|flat))7||1 ((music|sharp))2 3 ((music|sharp))4 ((music|sharp))5 6 7||1 ((music|flat))2 ((music|flat))3 4 ((music|flat))5 ((music|flat))6 ((music|double flat))7
|-
!Chord
|C<sup>((music|major))</sup>||D((music|halfdim))<sup>7</sup>||E–<sup>7</sup>or E<sup>7</sup>||F–<sup>((music|major))</sup>||G<sup>7</sup>||A ((music|flat))+<sup>((music|major))</sup>||B((music|diminished))<sup>7</sup>
|-
|}

{| class="wikitable"
|-
!Mode||I||II||III||IV||V||VI||VII
|-
!Name
|[[Double harmonic scale|Double harmonic]]||Lydian ((music|sharp))2 ((music|sharp))6||Phrygian ((music|bb))7 ((music|flat))4 (or Altered Diminished ((music|sharp))5)||[[Hungarian minor scale|Hungarian minor]]||Locrian ((music|natural))6 ((music|natural))3 or<br />Mixolydian ((music|flat))5 ((music|flat))2
|Ionian ((music|sharp))5 ((music|sharp))2||Locrian ((music|bb))3 ((music|bb))7
|-
!Notes
|1 ((music|flat))2 3 4 5 ((music|flat))6 7||1 ((music|sharp))2 3 ((music|sharp))4 5 ((music|sharp))6 7||1 ((music|flat))2 ((music|flat))3 ((music|flat))4 5 ((music|flat))6 ((music|bb))7||1 2 ((music|flat))3 ((music|sharp))4 5 ((music|flat))6 7||1 ((music|flat))2 3 4 ((music|flat))5 6 ((music|flat))7||1 ((music|sharp))2 3 4 ((music|sharp))5 6 7||1 ((music|flat))2 ((music|bb))3 4 ((music|flat))5 ((music|flat))6 ((music|bb))7
|-
!Chord
|C<sup>((music|major))</sup>||D((music|flat))<sup>((music|major))((music|sharp))11</sup>||E–6 or E6||F–<sup>((music|major))</sup>||G<sup>7((music|flat))5</sup>||A((music|flat))<sup>((music|major))((music|sharp))5</sup>||B((music|dim))<sup>((music|bb))3</sup>
|}

The number of possible modes for any intervallic set is dictated by the pattern of intervals in the scale. For scales built of a pattern of intervals that only repeats at the octave (like the diatonic set), the number of modes is equal to the number of notes in the scale. Scales with a recurring interval pattern smaller than an octave, however, have only as many modes as notes within that subdivision: e.g., the [[diminished scale]], which is built of alternating whole and half steps, has only two distinct modes, since all odd-numbered modes are equivalent to the first (starting with a whole step) and all even-numbered modes are equivalent to the second (starting with a half step).((Citation needed|date=January 2020))

The [[chromatic scale|chromatic]] and [[whole-tone scale]]s, each containing only steps of uniform size, have only a single mode each, as any rotation of the sequence results in the same sequence. Another general definition excludes these equal-division scales, and defines modal scales as subsets of them: according to [[Karlheinz Stockhausen]], "If we leave out certain steps of a[n equal-step] scale we get a modal construction".<ref>((harvp|Cott|1973|p=101))</ref> In "[[Olivier Messiaen|Messiaen's]] narrow sense, ''a mode is any scale'' made up from the 'chromatic total,' the twelve tones of the tempered system".<ref>((harvp|Vieru|1985|p=63))</ref>

==Analogues in different musical traditions==
*[[Hebrew cantillation|Cantillation]] ([[Jewish music]])
* [[Echos]] ([[Byzantine music]])
* [[Dastgah]] ([[Persian traditional music]])
* [[Arabic maqam|Maqam]] ([[Arabic music]])
* [[Maqam (disambiguation)#Musical structures|Makam]] (Arabic, Persian and [[Turkish classical music]])
* [[Raga]] ([[Indian classical music]])
* [[Thaat]] (North Indian or [[Hindustani music]])
* [[Melakarta]] (South Indian or [[Carnatic music]])
* [[Pann]] ([[Ancient Tamil music]])
* [[Pathet]] (Javanese music for [[gamelan]])
* [[Pentatonic scale]]

==See also==
* [[Gamut (music)]]
* [[Jewish prayer modes]]
* [[List of musical scales and modes]]
* [[Modal jazz]]
* [[Znamenny chant]]

==References==
===Footnotes===
((Reflist))

===Bibliography===
((div col|colwidth=45em))
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*((wikicite|ref=((harvid|West|1992))|reference=[[Martin Litchfield West|West, Martin L.]] (1992). ''Ancient Greek Music''. Oxford and New York: Oxford University Press ((ISBN|0-19-814975-1)).))
* ((wikicite|ref=((harvid|Wiering|1995))|reference=Wiering, Frans (1995). ''The Language of the Modes: Studies in the History of Polyphonic Modality''. Breukelen: Frans Wiering.))
* ((wikicite|ref=((harvid|Winnington-Ingram|1936))|reference=Winnington-Ingram, Reginald Pepys (1936). ''Mode in Ancient Greek Music''. Cambridge Classical Studies. Cambridge: [[Cambridge University Press]]. Reprinted, Amsterdam: Hakkert, 1968.))
((div col end))

==Further reading==
((div col|colwidth=45em))
* Brent, Jeff, with Schell Barkley (2011). ''Modalogy: Scales, Modes & Chords: The Primordial Building Blocks of Music''. Milwaukee: Hal Leonard Corporation. ((ISBN|978-1-4584-1397-0))
* Chalmers, John H. (1993). ''[http://eamusic.dartmouth.edu/~larry/published_articles/divisions_of_the_tetrachord/index.html Divisions of the Tetrachord / Peri ton tou tetrakhordou katatomon / Sectiones tetrachordi: A Prolegomenon to the Construction of Musical Scales]'', edited by Larry Polansky and Carter Scholz, foreword by Lou Harrison. Hanover, New Hampshire: Frog Peak Music. ((ISBN|0-945996-04-7)).
* [[Karl Gustav Fellerer|Fellerer, Karl Gustav]] (1982). "Kirchenmusikalische Reformbestrebungen um 1800". ''Analecta Musicologica: Veröffentlichungen der Musikgeschichtlichen Abteilung des Deutschen Historischen Instituts in Rom'' 21:393–408.
* [[Donald Jay Grout|Grout, Donald]], [[Claude V. Palisca]], and [[J. Peter Burkholder]] (2006). ''A History of Western Music''. New York: W. W. Norton. 7th edition. ((ISBN|0-393-97991-1)).
* Jowett, Benjamin (1937). ''The Dialogues of Plato'', translated by Benjamin Jowett, third edition, 2 vols. New York: Random House. ((OCLC|2582139))
* Jowett, Benjamin (1943). ''Aristotle's Politics'', translated by Benjamin Jowett. New York: Modern Library.
* Judd, Cristle (ed) (1998). ''Tonal Structures in Early Music: Criticism and Analysis of Early Music'', 1st ed. New York: Garland. ((ISBN|0-8153-2388-3)).
* Levine, Mark (1989). ''The Jazz Piano Book.'' Petaluma, California: Sher Music Co. ((ISBN|0-9614701-5-1)).
* Lonnendonker, Hans. 1980. "Deutsch-französische Beziehungen in Choralfragen. Ein Beitrag zur Geschichte des gregorianischen Chorals in der zweiten Hälfte des 19. Jahrhunderts". In ''Ut mens concordet voci: Festschrift Eugène Cardine zum 75. Geburtstag'', edited by Johannes Berchmans Göschl, 280–295. St. Ottilien: EOS-Verlag. ((ISBN|3-88096-100-X))
* [[Thomas J. Mathiesen|Mathiesen, Thomas J.]] (1999). [https://books.google.com/books?id=Td5odzctae8C&dq=Apollo%27s+Lyre+perfect+melos&pg=PA25 ''Apollo's Lyre: Greek Music and Music Theory in Antiquity and the Middle Ages'']. Publications of the Center for the History of Music Theory and Literature 2. Lincoln: University of Nebraska Press. ((ISBN|0-8032-3079-6)).
*McAlpine, Fiona (2004). "Beginnings and Endings: Defining the Mode in a Medieval Chant". ''Studia Musicologica Academiae Scientiarum Hungaricae'' 45, nos. 1 & 2 (17th International Congress of the International Musicological Society IMS Study Group Cantus Planus): 165–177.
* ((interlanguage link|Nicolas Meeùs|fr|Nicolas Meeùs (musicologue)|lt=Meeùs, Nicolas)) (1997). "Mode et système. Conceptions ancienne et moderne de la modalité". ''Musurgia'' 4, no. 3:67–80.
* Meeùs, Nicolas (2000). "Fonctions modales et qualités systémiques". ''Musicae Scientiae, Forum de discussion'' 1:55–63.
* Meier, Bernhard (1974). ''Die Tonarten der klassischen Vokalpolyphonie: nach den Quellen dargestellt''. Utrecht.
* Meier, Bernhard (1988). ''The Modes of Classical Vocal Polyphony: Described According to the Sources,'' translated from the German by Ellen S. Beebe, with revisions by the author. New York: Broude Brothers. ((ISBN|978-0-8450-7025-3))
* Meier, Bernhard (1992). ''Alte Tonarten: dargestellt an der Instrumentalmusik des 16. und 17. Jahrhunderts.'' Kassel
* Miller, Ron (1996). ''Modal Jazz Composition and Harmony'', Vol. 1. Rottenburg, Germany: Advance Music. ((OCLC|43460635))
* Ordoulidis, Nikos. (2011). "[https://web.archive.org/web/20120415140501/http://www.bpmonline.org.uk/bpm11/ordoulidis_the_greek_popular_modes.pdf The Greek Popular Modes]". ''British Postgraduate Musicology'' 11 (December). (Online journal, accessed 24 December 2011)
* Pfaff, Maurus (1974). "Die Regensburger Kirchenmusikschule und der cantus gregorianus im 19. und 20. Jahrhundert". ''Gloria Deo-pax hominibus. Festschrift zum hundertjährigen Bestehen der Kirchenmusikschule Regensburg'', Schriftenreihe des Allgemeinen Cäcilien-Verbandes für die Länder der Deutschen Sprache 9, edited by [[Franz Fleckenstein]], 221–252. Bonn: Allgemeiner Cäcilien-Verband, 1974.
* Powers, Harold (1998). "From Psalmody to Tonality". In ''Tonal Structures in Early Music'', edited by Cristle Collins Judd, 275–340. Garland Reference Library of the Humanities 1998; Criticism and Analysis of Early Music 1. New York: Garland Publishing. ((ISBN|0-8153-2388-3)).
* Ruff, Anthony, and Raphael Molitor (2008). "[http://search.proquest.com/openview/2aa97cf551ae17d9/1.pdf?pq-origsite=gscholar&cbl=199 Beyond Medici: The Struggle for Progress in Chant]". ''Sacred Music'' 135, no. 2 (Summer): 26–44.
* Scharnagl, August (1994). "[[Carl Proske]] (1794–1861)". In ''Musica divina: Ausstellung zum 400. Todesjahr von Giovanni Pierluigi Palestrina und Orlando di Lasso und zum 200. Geburtsjahr von Carl Proske. Ausstellung in der Bischöflichen Zentralbibliothek Regensburg, 4. November 1994 bis 3. Februar 1995'', Bischöfliches Zentralarchiv und Bischöfliche Zentralbibliothek Regensburg: Kataloge und Schriften, no. 11, edited by Paul Mai, 12–52. Regensburg: Schnell und Steiner, 1994.
* Schnorr, Klemens (2004). "El cambio de la edición oficial del canto gregoriano de la editorial Pustet/Ratisbona a la de Solesmes en la época del Motu proprio". In ''El Motu proprio de San Pío X y la Música (1903–2003). Barcelona, 2003'', edited by Mariano Lambea, introduction by María Rosario Álvarez Martínez and José Sierra Pérez. ''Revista de musicología'' 27, no. 1 (June) 197–209.
* Street, Donald (1976). "The Modes of Limited Transposition". ''[[The Musical Times]]'' 117, no. 1604 (October): 819–823.
* Vieru, Anatol (1980). ''Cartea modurilor''. Bucharest: Editura Muzicală. English edition, as ''The Book of Modes'', translated by Yvonne Petrescu and Magda Morait. Bucharest: Editura Muzicală, 1993.
* Vieru, Anatol (1992). "Generating Modal Sequences (A Remote Approach to Minimal Music)". ''[[Perspectives of New Music]]'' 30, no. 2 (Summer): 178–200. ((JSTOR|3090632))
* [[John Vincent (composer)|Vincent, John]] (1974). ''The Diatonic Modes in Modern Music'', revised edition. Hollywood: Curlew Music. ((OCLC|249898056))
* [[Egon Wellesz|Wellesz, Egon]] (1954). "Music of the Eastern Churches". ''[[The New Oxford History of Music]]'', vol. 2:14–57. Oxford University Press.
*Wiering, Frans (1998). "Internal and External Views of the Modes". In ''Tonal Structures in Early Music'', edited by Cristle Collins Judd, 87–107. Garland Reference Library of the Humanities 1998; Criticism and Analysis of Early Music 1. New York: Garland Publishing. ((ISBN|0-8153-2388-3)).
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==External links==
*[http://robsilverguitars.blogspot.co.uk/2013/07/modes-summary-all-modes-mapped-out-for.html All modes mapped out in all positions for 6, 7 and 8 string guitar]
*[http://www.jazzguitar.be/blog/guitar-modes/ The use of guitar modes in jazz music]
* [http://www.scribeserver.com/medieval/index.html#contents Neume Notation Project] ((Webarchive|url=https://web.archive.org/web/20110716022851/http://www.scribeserver.com/medieval/index.html#contents |date=2011-07-16 ))
* [http://eamusic.dartmouth.edu/~larry/published_articles/divisions_of_the_tetrachord/index.html Division of the Tetrachord], John Chalmers
* [http://graham.main.nc.us/~bhammel/MUSIC/Gmodes.html Greek and Liturgical Modes]
* [http://www.pathguy.com/modes.htm The Ancient Musical Modes: What Were They?], Eric Friedlander MD
* [http://www.looknohands.com/chordhouse/piano/ An interactive demonstration of many scales and modes]
* [http://homoecumenicus.com/ioannidis_music_ancient_greeks.htm The Music of Ancient Greeks], an approach to the original singing of the Homeric epics and early Greek epic and lyrical poetry by Ioannidis Nikolaos
* ''[https://archive.org/stream/aristoxenouharm00arisgoog Ἀριστοξενου ἁρμονικα στοιχεια: The Harmonics of Aristoxenus]'', edited with translation notes introduction and index of words by Henry S. Macran. Oxford: Clarendon Press, 1902.
* Monzo, Joe. 2004. "[http://www.tonalsoft.com/monzo/aristoxenus/aristoxenus.aspx The Measurement of Aristoxenus's Divisions of the Tetrachord]"

((Modes))
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