D (musical note)

D is a musical note a whole tone above C, and is known as Re within the fixed-Do solfege system. An enharmonic note is C, which is a diatonic semitone below D.
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of middle D is approximately 293.665 Hz. See pitch for a discussion of historical variations in frequency.

Designation by octave


Common scales beginning on D

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,...