D is a

musical note In music, notes are distinct and isolatable sounds that act as the most basic building blocks for nearly all of music. This musical analysis#Discretization, discretization facilitates performance, comprehension, and musical analysis, analysis. No ...

a whole tone above C, and is known as Re within the fixed-Do solfege system. Its

enharmonic In music, two written notes have enharmonic equivalence if they produce the same pitch but are notated differently. Similarly, written intervals, chords, or key signatures are considered enharmonic if they represent identical pitches that ar ...

equivalents are C (C-double sharp) and E (E-double flat). It is the third semitone of the

solfège In music, solfège (British English or American English , ) or solfeggio (; ), also called sol-fa, solfa, solfeo, among many names, is a mnemonic used in teaching aural skills, Pitch (music), pitch and sight-reading of Western classical music, W ...

. When calculated in

equal temperament An equal temperament is a musical temperament or Musical tuning#Tuning systems, tuning system that approximates Just intonation, just intervals by dividing an octave (or other interval) into steps such that the ratio of the frequency, frequencie ...

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

Designation by octave

Scales

Common scales beginning on D

D major D major is a major scale based on D (musical note), D, consisting of the pitches D, E (musical note), E, F♯ (musical note), F, G (musical note), G, A (musical note), A, B (musical note), B, and C♯ (musical note), C. Its key signature has two S ...

: D E F G A B C D * D harmonic major: D E F G A B C D * D melodic major ascending: D E F G A B C D * D melodic major descending: D C B A G F E D * D natural minor: D E F G A B C D * D harmonic minor: D E F G A B C D * D melodic minor ascending: D E F G A B C D * D melodic minor descending: D C B A G F E D

Diatonic scale In music theory a diatonic scale is a heptatonic scale, heptatonic (seven-note) scale that includes five whole steps (whole tones) and two half steps (semitones) in each octave, in which the two half steps are separated from each other by eith ...
s

* D Ionian: D E F G A B C D * D Dorian: D E F G A B C D * D Phrygian: D E F G A B C D * D Lydian: D E F G A B C D * D Mixolydian: D E F G A B C D * D Aeolian: D E F G A B C D * D Locrian: D E F G A B C D

Jazz melodic minor

* D ascending melodic minor: D E F G A B C D * D Dorian ♭2: D E F G A B C D * D Lydian augmented: D E F G A B C D * D Lydian dominant: D E F G A B C D * D Mixolydian ♭6: D E F G A B C D * D Locrian ♮2: D E F G A B C D * D altered: D E F G A B C D

References

{{Semitones Musical notes