The Middle C reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Middle C

In music, the term "middle C" refers to the pitch-class "C" located between the staves of the grand staff. When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the middle C note is approximately 261.625565 Hertz (though most people do not care about such high precision). See pitch (music) for a discussion of historical variations in frequency.

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