D♭ (musical note)

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D♭ (dee-flat) 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 (music) for a discussion of historical variations in frequency.