D is a musical note a whole tone above C, and is known as Re within the fixed-Do solfege system. Its enharmonic equivalents are C (C-double sharp) and E (E-double flat). It is the third semitone of the solfège. 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 scales

* 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