C (musical note)

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 (help·info)
C₀	C͵͵ or ͵͵C or CCC	Subcontra	16.352		Play (help·info)
C₁	C͵ or ͵C or CC	Contra	32.703		Play (help·info)
C₂	C	Great	65.406	Low C, cello C, 8' C (see organ pipe length)	Play (help·info)
C₃	c	Small	130.813	4' C or tenor C (organ), viola C	Play (help·info)
C₄	c′	One-lined	261.626	Middle C	Play (help·info)
C₅	c′′	Two-lined	523.251	Treble C, high C (written an octave higher for tenor voices)^[1]	Play (help·info)
C₆	c′′′	Three-lined	1046.502	High C (soprano)	Play (help·info)
C₇	c′′′′	Four-lined	2093.005	Double high C^[source?]	Play (help·info)
C₈	c′′′′′	Five-lined	4186.009	Eighth octave C, triple high C	Play (help·info)
C₉	c′′′′′′	Six-lined	8372.018	Quadruple high C	Play (help·info)
C₁₀	c′′′′′′′	Seven-lined	16744.036	Quintuple high C	Play (help·info)

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