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