Use in music of microtones (intervals smaller than a semitone)
Composer Charles Ives chose the chord above as a good candidate for a "fundamental" chord in the quarter tone scale, akin not to the tonic but to the major chord of traditional tonality
Two examples of an Ives fundamental chord with quarter tones
Microtonal music or microtonality is the use in music of microtones—intervals smaller than a semitone, also called "microintervals". It may also be extended to include any music using intervals not found in the customary Western tuning of twelve equal intervals per octave. In other words, a microtone may be thought of as a note that falls between the keys of a piano tuned in equal temperament.
Microtonal music can refer to any music containing microtones. The words "microtone" and "microtonal" were coined before 1912 by Maud MacCarthy Mann in order to avoid the misnomer "quarter tone" when speaking of the srutis of Indian music. Prior to this time the term "quarter tone" was used, confusingly, not only for an interval actually half the size of a semitone, but also for all intervals (considerably) smaller than a semitone. It may have been even slightly earlier, perhaps as early as 1895, that the Mexican composer Julián Carrillo, writing in Spanish or French, coined the terms microtono/micro-ton and microtonalismo/micro-tonalité.
In French, the usual term is the somewhat more self-explanatory micro-intervalle, and French sources give the equivalent German and English terms as Mikrointervall (or Kleinintervall) and micro interval (or microtone), respectively. "Microinterval" is a frequent alternative in English, especially in translations of writings by French authors and in discussion of music by French composers. In English, the two terms "microtone" and "microinterval" are synonymous. The English analogue of the related French term, micro-intervalité, however, is rare or nonexistent, normally being translated as "microtonality"; in French, the terms micro-ton, microtonal (or micro-tonal), and microtonalité are also sometimes used, occasionally mixed in the same passage with micro-intervale and micro-intervalité.
"Microtone" is also sometimes used to refer to individual notes, "microtonal pitches" added to and distinct from the familiar twelve notes of the chromatic scale, as "enharmonic microtones", for example.
In English the word "microtonality" is mentioned in 1946 by Rudi Blesh who related it to microtonal inflexions of the so-called "blues scales". In Court B. Cutting's 2019 Microtonal Analysis of “Blues Notes” and the Blues Scale, he states that academic studies of the early blues concur that its pitch scale has within it three microtonal “blue notes” not found in 12 tone equal temperament intonation. It was used still earlier by W. McNaught with reference to developments in "modernism" in a 1939 record review of the Columbia History of Music, Vol. 5. In German the term Mikrotonalität came into use at least by 1958, though "Mikrointervall" is still common today in contexts where very small intervals of early European tradition (diesis, comma, etc.) are described, as e.g. in the new Geschichte der Musiktheorie while "Mikroton" seems to prevail in discussions of the avant-garde music and music of Eastern traditions. The term "microinterval" is used alongside "microtone" by American musicologist Margo Schulter in her articles on medieval music.
The term "microtonal music" usually refers to music containing very small intervals but can include any tuning that differs from Western twelve-tone equal temperament. Traditional Indian systems of 22 śruti; Indonesian gamelan music; Thai, Burmese, and African music, and music using just intonation, meantone temperament or other alternative tunings may be considered microtonal. Microtonal variation of intervals is standard practice in the African-American musical forms of spirituals, blues and jazz.
Many microtonal equal divisions of the octave have been proposed, usually (but not always) in order to achieve approximation to the intervals of just intonation.
Terminology other than "microtonal" has been used or proposed by some theorists and composers. In 1914, A. H. Fox Strangways objected that "'heterotone' would be a better name for śruti than the usual translation 'microtone'". Modern Indian researchers yet write: "microtonal intervals called shrutis". In Germany, Austria, and Czechoslovakia in the 1910s and 1920s the usual term continued to be Viertelton-Musik (quarter tone music[page needed]), and the type of intervallic structure found in such music was called the Vierteltonsystem, which was (in the mentioned region) regarded as the main term for referring to music with microintervals, though as early as 1908 Georg Capellan had qualified his use of "quarter tone" with the alternative term "Bruchtonstufen (Viertel- und Dritteltöne)" (fractional degrees (quarter and third tones)). Despite the inclusion of other fractions of a whole tone, this music continued to be described under the heading "Vierteltonmusik" until at least the 1990s, for example in the twelfth edition of the Riemann Musiklexikon, and in the second edition of the popular Brockhaus Riemann Musiklexikon.
Ivan Wyschnegradsky used the term ultra-chromatic for intervals smaller than the semitone and infra-chromatic for intervals larger than the semitone; this same term has been used since 1934 by ethnomusicologist Victor Belaiev (Belyaev) in his studies of Azerbaijan and Turkish traditional music. A similar term, subchromatic, has been used by theorist Marek Žabka.Ivor Darreg proposed[when?] the term xenharmonic; see xenharmonic music. The Austrian composer Franz Richter Herf and the music theorist Rolf Maedel, Herf's colleague at the Salzburg Mozarteum, preferred using the Greek word ekmelic when referring to "all the pitches lying outside the traditional twelve-tone system". Some authors in Russia and some musicology dissertations disseminate the term микрохроматика (microchromatics), coined in the 1970s by Yuri Kholopov, to describe a kind of 'intervallic genus' (интервальный род) for all possible microtonal structures, both ancient (as enharmonic genus—γένος ἐναρμόνιον—of Greeks) and modern (as quarter tone scales of Alois Haba); this generalization term allowed also to avoid derivatives such as микротональность (microtonality, which could be understood in Russian as a sub-tonality, which is subordinate to the dominating tonality, especially in the context of European music of the 19th century) and микротоника (microtonic, "a barely perceptible tonic"; see a clarification in Kholopov ). Other Russian authors use the more international adjective 'microtonal' and have rendered it in Russian as 'микротоновый', but not 'microtonality' ('микротональность'). However, the terms 'микротональность' and 'микротоника' are also used. Some authors writing in French have adopted the term "micro-intervallique" to describe such music. Italian musicologist Luca Conti dedicated two of his monographs to microtonalismo, which is the usual term in Italian, and also in Spanish (e.g., as found in the title of Rué ). The analogous English form, "microtonalism", is also found occasionally instead of "microtonality", e.g., "At the time when serialism and neoclassicism were still incipient a third movement emerged: microtonalism".
The term "macrotonal" has been used for intervals wider than twelve-tone equal temperament,[better source needed] or where there are "fewer than twelve notes per octave", though "this term is not very satisfactory and is used only because there seems to be no other". The term "macrotonal" has also been used for musical form.
Examples of this can be found in various places, ranging from Claude Debussy's impressionistic harmonies to Aaron Copland's chords of stacked fifths, to John Luther Adams' Clouds of Forgetting, Clouds of Unknowing (1995), which gradually expands stacked-interval chords ranging from minor 2nds to major 7thsm. Louis Andriessen's De Staat (1972–1976) contains a number of "augmented" modes that are based on Greek scales but are asymmetrical to the octave.
The Hellenic civilizations of ancient Greece left fragmentary records of their music, such as the Delphic Hymns. The ancient Greeks approached the creation of different musical intervals and modes by dividing and combining tetrachords, recognizing three genera of tetrachords: the enharmonic, the chromatic, and the diatonic. Ancient Greek intervals were of many different sizes, including microtones. The enharmonic genus in particular featured intervals of a distinctly "microtonal" nature, which were sometimes smaller than 50 cents, less than half of the contemporary Western semitone of 100 cents. In the ancient Greek enharmonic genus, the tetrachord contained a semitone of varying sizes (approximately 100 cents) divided into two equal intervals called dieses (single "diesis", δίεσις); in conjunction with a larger interval of roughly 400 cents, these intervals comprised the perfect fourth (approximately 498 cents, or the ratio of 4/3 in just intonation). Theoretics usually described several diatonic and chromatic genera (some as chroai, "coloration" of one specific intervallic type), but the enarmonic genus was always the only one (argumented as one with the smallest intervals possible).
Vicentino's archicembalo in cents
Guillaume Costeley's "Chromatic Chanson", "Seigneur Dieu ta pitié" of 1558 used 1/3 comma meantone and explored the full compass of 19 pitches in the octave.
The Italian Renaissance composer and theorist Nicola Vicentino (1511–1576) worked with microtonal intervals and built a keyboard with 36 keys to the octave known as the archicembalo. While theoretically an interpretation of ancient Greek tetrachordal theory, in effect Vicentino presented a circulating system of quarter-comma meantone, maintaining major thirds tuned in just intonation in all keys.
In 1760 the French flautist Charles de Lusse [de] published a treatise, L'Art de la flute traversiere, all surviving copies of which conclude with a composition (possibly added a year or two after the actual publication of the volume) incorporating several quarter tones, titled Air à la grecque, accompanied by explanatory notes tying it to the realization of the Greek enharmonic genus and a chart of quarter tone fingerings for the entire range of the one-keyed flute. Shortly afterward, in a letter published in the Mercure de France in September 1764, the celebrated flautist Pierre-Gabriel Buffardin mentioned this piece and expressed an interest in quarter tones for the flute.
Jacques Fromental Halévy composed a cantata "Prométhée enchaîné" for a solo voice, choir and orchestra (premiered in 1849), where in one movement (Choeur des Océanides) he used quarter tones, to imitate the enharmonic genus of Greeks.
Alexander John Ellis, who in the 1880s produced a translation of Hermann Helmholtz's On the Sensations of Tone, proposed an elaborate set of exotic just intonation tunings and non-harmonic tunings. Ellis also studied the tunings of non-Western cultures and, in a report to the Royal Society, stated that they used neither equal divisions of the octave nor just intonation intervals. Ellis inspired Harry Partch immensely.
During the Exposition Universelle of 1889, Claude Debussy heard a Balinese gamelan performance and was exposed to non-Western tunings and rhythms. Some scholars have ascribed Debussy's subsequent innovative use of the whole-tone (six equal pitches per octave) tuning in such compositions as the Fantaisie for piano and orchestra and the Toccata from the suite Pour le piano to his exposure to the Balinese gamelan at the Paris exposition, and have asserted his rebellion at this time "against the rule of equal temperament" and that the gamelan gave him "the confidence to embark (after the 1900 world exhibition) on his fully characteristic mature piano works, with their many bell- and gong-like sonorities and brilliant exploitation of the piano's natural resonance". Still others have argued that Debussy's works like L'isle joyeuse, La cathédrale engloutie, Prélude à l'après-midi d'un faune, La mer, Pagodes, Danseuses de Delphes, and Cloches à travers les feuilles are marked by a more basic interest in the microtonal intervals found between the higher members of the overtone series, under the influence of Helmholtz's writings.Emil Berliner's introduction of the phonograph in the 1890s allowed much non-Western music to be recorded and heard by Western composers, further spurring the use of non-12-equal tunings.
Major microtonal composers of the 1920s and 1930s include Alois Hába (quarter tones, or 24 equal pitches per octave, and sixth tones), Julián Carrillo (24 equal, 36, 48, 60, 72, and 96 equal pitches to the octave embodied in a series of specially custom-built pianos), Ivan Wyschnegradsky (third tones, quarter tones, sixth tones and twelfth tones, non octaving scales) and the early works of Harry Partch (just intonation using frequencies at ratios of prime integers 3, 5, 7, and 11, their powers, and products of those numbers, from a central frequency of G-196).
Prominent microtonal composers or researchers of the 1940s and 1950s include Adriaan Daniel Fokker (31 equal tones per octave), Partch (continuing to build his handcrafted orchestra of microtonal just intonation instruments), and Eivind Groven.
Digital synthesizers from the Yamaha TX81Z (1987) on and inexpensive software synthesizers have contributed to the ease and popularity of exploring microtonal music.
Microtonality in electronic music
Electronic music facilitates the use of any kind of microtonal tuning, and sidesteps the need to develop new notational systems. In 1954, Karlheinz Stockhausen built his electronic Studie II on an 81-step scale starting from 100 Hz with the interval of 51/25 between steps, and in Gesang der Jünglinge (1955–56) he used various scales, ranging from seven up to sixty equal divisions of the octave. In 1955, Ernst Krenek used 13 equal-tempered intervals per octave in his Whitsun oratorio, Spiritus intelligentiae, sanctus.
In 1986, Wendy Carlos experimented with many microtonal systems including just intonation, using alternate tuning scales she invented for the album Beauty In the Beast. "This whole formal discovery came a few weeks after I had completed the album, Beauty in the Beast, which is wholly in new tunings and timbres".
In 2016, electronic music composed with arbitrary microtonal scales was explored on the album Radionics Radio: An Album of Musical Radionic Thought Frequencies by British composer Daniel Wilson, who derived his compositions' tunings from frequency-runs submitted by users of a custom-built web application replicating radionics-based electronic soundmaking equipment used by Oxford's De La Warr Laboratories in the late 1940s, thereby supposedly embodying thoughts and concepts within the tunings.
Finnish artist Aleksi Perälä (Rephlex) works exclusively in a microtonal system known as the Colundi sequence.
Limitations of some synthesizers
The General MIDI Specification does not directly support microtonal music, because each note-on and note-off message only represents one chromatic tone. However, microtonal scales can be emulated using pitch bending, such as in LilyPond's implementation.
Although some synthesizers allow the creation of customized microtonal scales, this solution does not allow compositions to be transposed. For example, if each B note is raised one quarter tone, then the "raised 7th" would only affect a C major scale.
A form of microtone known as the blue note is an integral part of rock music and one of its predecessors, the blues. The blue notes, located on the third, fifth, and seventh notes of a diatonic major scale, are flattened by a variable microtone. Joe Monzo has made a microtonal analysis of the song "Drunken Hearted Man", written and recorded by the delta blues musician Robert Johnson.
English rock band Radiohead has used microtonal string arrangements in its music, such as on "How to Disappear Completely" from the album Kid A.
American band Secret Chiefs 3 has been making its own custom "microtonal" instruments since the mid 1990s. The proprietary tuning system they use in their Ishraqiyun aspect is ratio-based, not equal temperament. The band's leader Trey Spruance, also of Mr. Bungle challenges the terminology of "microtonality" as a development that instead of liberating tonal sensibility to a universe of diverse possibilities, both new and historical, instead mainly serves to reinforce the idea that the universal standard for "tone" is the (western) semitone.
Karlheinz Stockhausen (Germany, 1928–2007, in his electronic works many microtonal concepts, non-octaving scales in Studie II, just intonation in Gruppen and Stimmung, occasional microtonal instrumental and vocal writing throughout Licht)
^Whitfield, Charles (1989). L'anglais musicologique: l'anglais des musiciens. Guides Musicologiques. Paris: Editions Beauchesne. p. 13. ISBN2-7010-1181-7.
^Battier, Marc; Lacino, Thierry (1984). "Simulation and Extrapolation of Instrumental Sounds Using Direct Synthesis at IRCAM (A Propos of Resonance)". Contemporary Music Review. 1 (Musical Thought at IRCAM, edited by Tod Machover): 77–82. doi:10.1080/07494468400640081. hdl:2027/spo.bbp2372.1982.033.
^Boulez, Pierre (1958). Translated by Goehr, Alexander. "At the Ends of Fruitful Land ...". Die Reihe (English ed.). 1, Electronic Music: 22–23.
^Rae, Caroline (2013). "Messiaen and Ohana: Parallel Preoccupations or Anxiety of Influence?". In Fallon, Robert; Dingle, Christopher (eds.). Messiaen Perspectives 2: Techniques, Influence and Reception. Farnham: Ashgate Publishing, Ltd. pp. 164, 174n40. ISBN978-1-4094-2696-7.
^Maclagan, Susan J. (2009). A Dictionary for the Modern Flutist. Lanham, MS, and Plymouth: Scarecrow Press, Inc. p. 109. ISBN978-0-8108-6711-6.
^Rigoni, Michel (1998). Karlheinz Stockhausen: ... un vaisseau lancé vers le ciel. Musique de notre temps: compositeurs (in French) (Second, revised, corrected, and enlarged ed.). Lillebonne: Millénaire III Éditions. p. 314. ISBN978-2-911906-02-2.
^Apel, Will (1974). The Harvard Dictionary of Music (Second ed.). Cambridge, Massachusetts, USA: Harvard University Press. p. 527.
^Barbera, André (2003). "Comma, Schisma". In Randel, Don Michael (ed.). Harvard Dictionary of Music (Fourth ed.). Cambridge, Massachusetts, USA: The Belknap Press of Harvard University Press. p. 193. ISBN978-0-674-01163-2.
^Prieberg, Fred K. (1958). Lexikon der Neuen Musik. Freiburg im Breisgau and Munich: K. Alber. p. 288.
^Prieberg, Fred K. (1960). Musica ex machina: über das Verhältnis von Musik und Technik. Berlin, Frankfurt, and Vienna: Verlag Ullstein. pp. 29–32, 210–212, inter alia.
^Zaminer, Frieder (2006). "Harmonik und Musiktheorie im alten Griechenland". In Ertelt, Thomas; von Loesch, Heinz; Zaminer, Frieder (eds.). Geschichte der Musiktheorie, Vol. 2. Darmstadt: Wissenschaftliche Buchgesellschaft. p. 94. ISBN3-534-01202-X.
^Dahlhaus, Carl; Eggebrecht, Hans Heinrich; Oehl, Kurt, eds. (1995). Brockhaus Riemann Musiklexikon in vier Bänden und einem Ergänzungsband, Volume 4 [Brockhaus Riemann Music Lexicon in Four Volumes and a Supplementary Volume] (Second ed.). Mainz: Atlantis-Schott Musikbuch-Verlag. p. 304.
^Wyschnegradsky, Ivan (1972). "L'Ultrachromatisme et les espaces non octaviants". La Revue musicale (290–91): 84–87.
^Belyaev, Victor M. [Беляев, В. М.] (1971). "Азербайджанская народная песня (1960)" [Azerbaijan Folk Songs]. In Belyaev, Victor (ed.). О музыкальном фольклоре и древней письменности [On Musical Folklore and Ancient Literature]. Moscow: Sov'etskii Kompozitor. pp. 108–156.
^Belyaev, Victor M. [Беляев, В. М.] (1971). "Турецкая музыка (1934)" [Turkish Music]. In Belyaev, Victor (ed.). О музыкальном фольклоре и древней письменности [On Musical Folklore and Ancient Literature]. Moscow: Sov'etskii Kompozitor. pp. 163–176.
^"Микрохроматика" [Mikrochromatika / Microchromatics]. Музыкальный энциклопедический словарь [Musical Encyclopedic Dictionary] (in Russian). Moscow: Sov'etskaya Entsiklopediya. 1990. p. 344.
^"Микрохроматические интервалы" [Mikrochromaticheskie Intervali / Microchromatic Intervals]. Музыкальный словарь Гроува [Grove Music Dictionary] (in Russian) (Second ed.). Moscow: Praktika. 2007. p. 563.
^Akopyan, Levon. Музыка ХХ века. Энциклопедический словарь [Music of the Twentieth Century: An Academic Dictionary] (in Russian). Moscow: Praktika. pp. 353–354.
^Tsenova, V. S. [Ценова, В. С.], ed. (2007). Теория современной композиции [The Theory of Modern Composition] (in Russian). Moscow: Muzyka. pp. 65, 123, 152 etc.
^Kholopov, Y. [Ю. ХОЛОПОВ]; Kirillina, L. [л. КИРИЛЛИНА]; Kyuregyan, T. [Т. КЮРЕГЯН]; Lyzhov, G. [г. ЛЫЖОВ]; Pospelova, R. [Р. ПОСПЕЛОВА]; Tsenova, V. [В. ЦЕНОВА] (2006), Музыкально-теоретические системы [Musical-Theoretical Systems] (PDF) (in Russian), Moscow: Kompozitor, pp. 86 etc.
^Klishin, A. G. (2010). Проблемы музыкального строя в начале Нового времени [Problems of Musical Structure in the Early Modern Era] (PhD diss.). Moscow: Moscow Conservatory.
^Gurenko, N.A. [Гуренко Н.А] (2010). Микрохроматика И. Вышнеградского: История, теория, практика освоения [The Microchomatics of I. Wyschnegradsky: History, Theory, Practice, Development] (PhD diss.). Urals Mussorgsky State Conservatoire.
^Polunina, E. N. [Полунина Е.Н.] (2010). Микрохроматика в музыкальном искусстве позднего Возрождения [Microchromatics in Music of the Late Renaissance] (PhD diss.). Vladivostok: Far East State Academy of Arts.
^Rovner, A. A. (2010). Сергей Протопопов: композиторское творчество и теоретические работы [Sergey Protopopov: composer's output and theoretical works] (PhD diss.). Moscow: Moscow Conservatory.
^Nikoltsev, I. D. (2013). Микрохроматика в системе современного музыкального мышления [Microchomatics in Contemporary Musical Thought] (PhD diss.). Moscow: Moscow Conservatory.
^More references can be located on the disserCat website, at "Поиск диссертаций" [Search for dissertations].
^Kholopov, Y. N. [Холопов Ю.Н.] (2000). "Микро и последствия" [Micro and consequences]. Музыкальное образование в контексте культуры [Music education in the cultural context]. Moscow: Gnessins Music Academy. pp. 27–38.
^Kogut, Gennady. A. (2005). Микротоновая музыка [Microtonal Music] (in Russian). Kyiv: Naukova Dumka. ISBN966-00-0604-7.
^Criton, Pascale (2010). "Variabilité et multiplicité acoustique" [Variability and acoustic multiplicity]. In Soulez, Antonia; Vaggione, Horacio (eds.). Manières de faire des sons [Ways of making sounds]. Musique-philosophie (in French). Paris: L'Harmattan. pp. 119–133. ISBN978-2-296-12959-7.
^Conti, Luca (2005), Suoni di una terra incognita: il microtonalismo in Nord America (1900–1940) [Sounds of an unknown land: microtonalism in North America (1900–1940)] (in Italian), Lucca: Libreria musicale italiana
^Conti, Luca (2008), Ultracromatiche sensazioni: il microtonalismo in Europa (1840–1940) [Ultrachromatic sensations: microtonalism in Europe (1840–1940)] (in Italian), Lucca: Libreria musicale italiana
^Rué, Roberto (2000). "Diatonismo, cromatismo y microtonalismo: Una interpretación estructuralista" [Diatonism, chromaticism and microtonalism: A structuralist interpretation]. Música e investigación: Revista del Instituto Nacional de Musicología "Carlos Vega" [Music and research: Magazine of the National Institute of Musicology "Carlos Vega"] (in Spanish). 4 (7–8): 39–53.
^Chou, Wen-chung (April 1971). "Asian Concepts and Twentieth-Century Western Composers". The Musical Quarterly. 57 (2): 211–229.
^"Macrotonal". Xenharmonic Wiki blog at macrospaces.com. n.d. Archived from the original on July 14, 2016. Retrieved 3 February 2016.
^Pressing, Jeff (1992). Synthesizer Performance and Real-time Techniques. Madison: A-R Editions. p. 239. ISBN978-0-89579-257-0.
^Spring, Glenn; Hutcheson, Jere (2013). Musical Form and Analysis: Time, Pattern, Proportion. Long Grove: Waveland Press, Inc. p. 82. ISBN978-1-4786-0722-9.
^Adlington, Robert (2004), Louis Andriessen, De Staat, Hants, UK: Ashgate Publishing, p. 88
^Lindley, Mark (2001). "Mean-tone". In Sadie, Stanley; Tyrrell, John (eds.). The New Grove Dictionary of Music and Musicians (Second ed.). London: Macmillan Publishers.
^Barbour, J. Murray (1951). Tuning and Temperament: A Historical Survey (Reprinted [n.p.]: Dover, 2004 ed.). East Lansing, Michigan, USA: Michigan State College Press. pp. 117–18. ISBN0-486-43406-0.
^Koenig, Laura Jeanne (1995). Air à la grecque: A Quarter-tone Piece for Flute in the Historical Context of the Enharmonic Genre in Eighteenth-century French Music and Theory (DMA diss.). Iowa City, Iowa, USA: The University of Iowa. pp. iii, 1, 9–10, 52–55, 116–119.
^Reilly, Edward R.; Solum, John (Spring 1992). "De Lusse, Buffardin, and an Eighteenth-Century Quarter Tone Piece". Historical Performance: 19–23.
^Helmholtz, Hermann von (1885). On the Sensations of Tone as a Physiological Basis for the Theory of Music: second English edition, translated, thoroughly revised and corrected, rendered conformable to the fourth (and last) German edition of 1877, with numerous additional notes and a new additional appendix bringing down information to 1885, and especially adapted to the use of music students by Alexander J. Ellis. London: Longmans, Green. pp. 514–527.
^Lesure, François (2001). "Debussy, (Achille-)Claude: §7, 'Models and Influences'". In Sadie, Stanley; Tyrrell, John (eds.). The New Grove Dictionary of Music and Musicians (Second ed.). London: Macmillan Publishers.
^Howat, Roy (2001). "Debussy, (Achille-)Claude: §10, 'Musical Language'". In Sadie, Stanley; Tyrrell, John (eds.). The New Grove Dictionary of Music and Musicians (Second ed.). London: Macmillan Publishers.
Adèr, Lidiâ Olegovna [Адэр, Лидия Олеговна]. 2011a. "Микротоновая идея: Истоки и предпосылки" [The Concept of Microtonality: Its Origin and Background]. Научный журнал Санкт-Петербургской консерватории [Opera musicologica: Naučnyj žurnal Sankt-Peterburgskoj konservatorii] 3–4, nos. 8–9:114–134.
Adèr, Lidiâ Olegovna [Адэр, Лидия Олеговна]. 2011b. "Микротоновый инструментарий—первые шаги от утопии к практике" [Microtonal Instruments: The First Steps from Utopia to Practice]. In Временник Зубовского института: Инструментализм в истории культуры [Instrumentalism in the history of culture], edited by Evgenia Vladimirovna Hazdan, 52–65. Vremennik Zubovskogo instituta 7. St. Petersburg: Rossijskij Institut Istorii Iskusstv.
Aron, Pietro. 1523. Thoscanello de la musica. Venice: Bernardino et Mattheo de Vitali. Facsimile edition, Monuments of music and music literature in facsimile: Second series, Music literature 69. New York: Broude Brothers, 1969. Second edition, as Toscanello in musica... nuovamente stampato con laggiunta da lui fatta et con diligentia corretto, Venice: Bernardino & Matheo de Vitali, 1529. Facsimile reprint, Bibliotheca musica Bononiensis, sezione 2., n. 10. Bologna: Forni Editori, 1969. Online edition of the 1529 text(in Italian). Third edition, as Toscanello in musica, Venice: Marchio Stessa, 1539. Facsimile edition, edited by Georg Frey. Kassel: Bärenreiter, 1970. Fourth edition, Venice, 1562. English edition, as Toscanello in music, translated by Peter Bergquist. 3 vols. Colorado College Music Press Translations, no. 4. Colorado Springs: Colorado College Music Press, 1970.
Barbieri, Patrizio. 1989. "An Unknown 15th-Century French Manuscript on Organ Building and Tuning". The Organ Yearbook: A Journal for the Players & Historians of Keyboard Instruments 20.
Barbieri, Patrizio. 2002. "The Evolution of Open-Chain Enharmonic Keyboards c1480–1650". In Chromatische und enharmonische Musik und Musikinstrumente des 16. und 17. Jahrhunderts/Chromatic and Enharmonic Music and Musical Instruments in the 16th and 17th Centuries. Schweizer Jahrbuch für Musikwissenschaft/Annales suisses de musicologie/Annuario svizzero di musicologia 22, edited by Joseph Willimann. Bern: Verlag Peter Lang AG. ISBN3-03910-088-2.
Barbieri, Patrizio. 2003. "Temperaments, Historical". In Piano: An Encyclopedia, second edition, edited by Robert Palmieri and Margaret W. Palmieri,[page needed]. New York: Routledge.
Barbieri, Patrizio, Alessandro Barca, and conte Giordano Riccati. 1987. Acustica accordatura e temperamento nell'illuminismo Veneto. Pubblicazioni del Corso superiore di paleografia e semiografia musicale dall'umanesimo al barocco, Serie I: Studi e testi 5; Pubblicazioni del Corso superiore di paleografia e semiografia musicale dall'umanesimo al barocco, Documenti 2. Rome: Edizioni Torre d'Orfeo.
Barbieri, Patrizio, and Lindoro Massimo del Duca. 2001. "Late-Renaissance Quarter-tone Compositions (1555–1618): The Performance of the ETS-31 with a DSP System". In Musical Sounds from Past Millennia: Proceedings of the International Symposium on Musical Acoustics 2001, edited by Diego L. González, Domenico Stanzial, and Davide Bonsi. 2 vols. Venice: Fondazione Giorgio Cini.
Barlow, Clarence (ed.). 2001. "The Ratio Book." (Documentation of the Ratio Symposium Royal Conservatory The Hague 14–16 December 1992). Feedback Papers 43.
Blackwood, Easley. 1985. The Structure of Recognizable Diatonic Tunings. Princeton: Princeton University Press. ISBN0-691-09129-3.
Blackwood, Easley. 1991. "Modes and Chord Progressions in Equal Tunings". Perspectives of New Music 29, no. 2 (Summer): 166–200.
Burns, Edward M. 1999. "Intervals, Scales, and Tuning." In The Psychology of Music, second edition, ed. Diana Deutsch. 215–264. San Diego: Academic Press. ISBN0-12-213564-4.
Carr, Vanessa. 2008. "These Are Ghost Punks". Vanessa Carr's website (29 February). (Accessed 2 April 2009)
Colonna, Fabio. 1618. La sambuca lincea, overo Dell'istromento musico perfetto. Naples: C. Vitale. Facsimile reprint of a copy containing manuscript critical annotations by Scipione Stella (1618–1624), with an introduction by Patrizio Barbieri. Musurgiana 24. Lucca, Italy: Libreria Musicale Italiana, 1991.
Daniels, Arthur Michael. 1965. "Microtonality and Mean-Tone Temperament in the Harmonic System of Francisco Salinas". Journal of Music Theory 9, no. 1 (Spring): 2–51.
Fink, Robert. 1988. "The Oldest Song in the World". Archaeologia Musicalis 2, no. 2:98–100.
Fritsch, Johannes G. 2007. "Allgemeine Harmonik, Tonsysteme, Mikrotonalität: Ein geschichtlicher Überblick". In Orientierungen: Wege im Pluralismus der Gegenwartsmusik, edited by Jörn Peter Hiekel, 107–122. Veröffentlichungen des Instituts für Neue Musik und Musikerziehung Darmstadt 47. Mainz: Schott Musik International. ISBN978-3-7957-1837-4.
Gilmore, Bob. 1998. Harry Partch: A Biography. New Haven: Yale University Press. ISBN0-300-06521-3.
Haas, Georg Friedrich. 2007. "Mikrotonalität und spektrale Musik seit 1980". In Orientierungen: Wege im Pluralismus der Gegenwartsmusik, edited by Jörn Peter Hiekel, 123–129. Veröffentlichungen des Instituts für Neue Musik und Musikerziehung Darmstadt 47. Mainz: Schott Musik International. ISBN978-3-7957-1837-4.
Hába, Alois. 1927. Neue Harmonielehre des diatonischen, chromatischen Viertel-, Drittel-, Sechstel- und Zwölftel-tonsystems. Leipzig: Kistner & Siegel.
Johnston, Ben. 2006. 'Maximum Clarity' and other writings on music, ed. B. Gilmore. Urbana and Chicago: University of Illinois Press.
Mosch, Ulrich. 2008. "Ultrachromatik und Mikrotonalität: Hans Zenders Grundlegung einer neuen Harmonik". In Hans Zender: Vielstimmig in sich, edited by Werner Grünzweig, Anouk Jeschke, and Jörn Peter Hiekel, 61–76. Archive zur Musik des 20. Jahrhunderts, No. 12. Hofheim:Wolke. ISBN978-3-936000-25-2.
Stahnke, Manfred. 2010. "About Backyards and Limbos: Microtonality Revisited". In Concepts, Experiments and Fieldwork: Studies in Systematic Musicology and Ethnomusicology, edited by Rolf Bader, Christiane Neuhaus, and Ulrich Morgenstern, with a prefaceby Achim Reichel, 297–314. Frankfurt am Main and New York: Peter Lang. ISBN978-3-631-58902-1.
Vitale, Raoul. 1982. "La Musique suméro-accadienne: gamme et notation musicale". Ugarit-Forschungen 14: 241–263.
Werntz, Julia. 2001. "Adding Pitches: Some New Thoughts, Ten Years after Perspectives of New Music's 'Forum: Microtonality Today'". Perspectives of New Music 39, no. 2 (Summer): 159–210.
Wood, James. 1986. "Microtonality: Aesthetics and Practicality". The Musical Times 127, no. 1719 (June): 328–330.
Wyschnegradsky, Ivan. 1937. "La musique à quarts de ton et sa réalisation pratique". La Revue Musicale no. 171:26–33.
Zweifel, Paul. 1996. "Generalized Diatonic and Pentatonic Scales: A Group-Theoretic Approach". Perspectives of New Music 34, no. 1 (Winter): 140–161.