C♯ (musical note)

C♯ (C-sharp) is a musical note lying a chromatic semitone above C and a diatonic semitone below D; it is the second semitone of the solfège. C-sharp is thus enharmonic to D♭. It is the second semitone in the French solfège and is known there as do dièse. In some European notations, it is known as Cis. In equal temperament it is also enharmonic with B (B-double sharp/Hisis).

When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of C♯₄ (the C♯ above middle C) is about 277.183 Hz.^[1] See pitch (music) for a discussion of historical variations in frequency.

[1]

Scientific designation	Helmholtz designation	Octave name	Frequency (Hz)	MIDI note number
C♯₋₁	C♯͵͵͵ or ͵͵͵C♯ or CCCC♯	Subsubcontra	8.662	1
C♯₀	C♯͵͵ or ͵͵C♯ or CCC♯	Subcontra	17.324	13
C♯₁	C♯͵ or ͵C♯ or CC♯	Contra	34.648	25
C♯₂	C♯	Great	69.296	37
C♯₃	c♯	Small	138.591	49
C♯₄	c♯′	One-lined	277.183	61
C♯₅	c♯′′	Two-lined	554.365	73
C♯₆	c♯′′′	Three-lined	1108.731	85
C♯₇	c♯′′′′	Four-lined	2217.461	97
C♯₈	c♯′′′′′	Five-lined	4434.922	109
C♯₉	c♯′′′′′′	Six-lined	8869.844	121
C♯₁₀	c♯′′′′′′′	Seven-lined	17739.688	N/A

C♯ (musical note)

Designation by octave

Scales

Common scales beginning on C♯

Diatonic scales

Jazz melodic minor

References

See also

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