C (musical note)

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

Middle C 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[source?]	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

Middle C

Middle C is the musical note C that is in the middle of the piano keyboard. It is not perfectly in the middle of the keyboard, but very nearly. When you compare all the Cs in the piano, it is the one nearest to the middle.

When writing Middle C in music notation, it is below the stave when using the treble clef and just above the stave when using the bass clef. This is shown in the first and last notes of the musical example below. The Middle C sits on a ledger line (an extension of the stave written just for one note).