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D note
D note

D[1] is a musical note a whole tone above C,[2] and is known as Re within the fixed-Do solfege system. An enharmonic note is C

,[3] which is a diatonic semitone below D.[4]

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of middle D (D4) is approximately 293.665 Hz. See pitch for a discussion of historical variations in frequency.

Designation by octave

Scientific designation Helmholtz designation Octave name Frequency (Hz)
D−1 D͵͵͵ or ͵͵͵D or DDDD Subsubcontra 9.177
D0 D͵͵ or ͵͵D or DDD Subcontra 18.354
D1 D͵ or ͵D or DD Contra 36.708
D2 D Great 73.416
D3 d Small 146.832
D4 d′ One-lined 293.665
D5 d′′ Two-lined 587.33
D6 d′′′ Three-lined 1174.659
D7 d′′′′ Four-lined 2349.318
D8 d′′′′′ Five-lined 4698.636
D9 d′′′′′′ Six-lined 9397.273
D10 d′′′′′′′ Seven-lined 18794.545


Common scales beginning on D

Diatonic scales

Jazz melodic minor

We use the note D as the standard note, Dorian mode as the standard mode, and the conjugates are: D self, A-G, E-C, B-F, F#-Bb, C#-Eb, G#-Ab (enharmonic equivalent), ... (the (white or black) keys on the piano are symmetry)

See also