In
music,
Middle C, sometimes written C4, is the
note between the
treble clef and the
bass clef. It is also in the middle of the
musical keyboard. Middle C has is own
clef symbol, the
C clef; three clefs using this symbol are the
tenor clef,
alto clef, and
soprano clef[?]. The
frequency of middle C is about 261
Hertz.