C (musical note)

Middle C  Play (info • help)

C or Do is the first note of the C major scale.

Designation by octave

Scientific designation	Helmholtz designation	Octave name	Frequency (Hz)	Other names	Audio
C−1	C͵͵͵ or ͵͵͵C or CCCC	Octocontra	8.176		Play (info • help)
C0	C͵͵ or ͵͵C or CCC	Subcontra	16.352		Play (info • help)
C1	C͵ or ͵C or CC	Contra	32.703		Play (info • help)
C2	C	Great	65.406	Low C, cello C, 8' C (see organ pipe length)	Play (info • help)
C3	c	Small	130.813	4' C or tenor C (organ), viola C	Play (info • help)
C4	c′	One-lined	261.626	Middle C	Play (info • help)
C5	c′′	Two-lined	523.251	Treble C, high C (written an octave higher for tenor voices)	Play (info • help)
C6	c′′′	Three-lined	1046.502	High C (soprano)	Play (info • help)
C7	c′′′′	Four-lined	2093.005	Double high C	Play (info • help)
C8	c′′′′′	Five-lined	4186.009	Eighth octave C, triple high C	Play (info • help)
C9	c′′′′′′	Six-lined	8372.018	Quadruple high C	Play (info • help)
C10	c′′′′′′′	Seven-lined	16744.036	Quintuple high C	Play (info • help)