C♯ (musical note)

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C♯ (C sharp) is a musical note lying a chromatic semitone above C and a diatonic semitone below D. C sharp is thus enharmonic to D♭ (D flat). It is the second semitone in the French solfege and is known there as Do Dièse.

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of C♯ is approximately 277.183 Hz. See pitch (music) for a discussion of historical variations in frequency.

v • d • e Notes of the Chromatic Scale C · C♯ · D♭ · D · D♯ · E♭ · E · F · F♯ · G♭ · G · G♯ · A♭ · A · A♯ · B♭ · B