Definition A in Music
A is note of the scale (6th degree of natural scale of C). Hence Ab, Abb, Anat., A#, A##, A major, A minor, etc. A is note commonly used for tuning instrument (orchestras, tune to the ob. A). A = 440 vibrations per second, internationally accepted since 1939, although some orchestras still accept A = 435 and (in USA) A = 445.
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