D♭ (musical note)


D is a musical note lying a diatonic semitone above C and a chromatic semitone below D. It is thus enharmonic to C. In the French solfège it is known as re bémol.
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of middle D is approximately 277.183 Hz. See pitch for a discussion of historical variations in frequency.

Designation by octave

Scales

Common scales beginning on D