C♯ (musical note)

C♯ (musical note)

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. It is the second semitone in the French solfège 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 C4 (the C above middle C) is about 277.18 Hz. See pitch (music) for a discussion of historical variations in frequency.

Designation by octave

Scientific designation Helmholtz designation Bilinear music notation Octave name Frequency (Hz)
C-1 C͵͵͵ or ͵͵͵C or CCCC (-uC) Subsubcontra 8.662
C0 C͵͵ or ͵͵C or CCC (-vC) Subcontra 17.324
C1 C͵ or ͵C or CC (-wC) Contra 34.648
C2 C (-xC) Great 69.296
C3 c (-yC) Small 138.591
C4 c (zC) One-lined 277.183
C5 c′′ (yC) Two-lined 554.365
C6 c′′′ (xC) Three-lined 1108.731
C7 c′′′′ (wC) Four-lined 2217.461
C8 c′′′′′ (vC) Five-lined 4434.922
C9 c′′′′′′ (uC) Six-lined 8869.844
C10 c′′′′′′′ (tC) Seven-lined 17739.688

Common scales beginning on C

  • C Major: C D E F G A B C
  • C Natural Minor: C D E F G A B C
  • C Harmonic Minor: C D E F G A B C
  • C Melodic Minor Ascending: C D E F G A B C
  • C Melodic Minor Descending: C B A G F E D C
  • C Dorian: C D E F G A B C

See also