Definition of pitch class
: the set of all musical pitches of the same name regardless of octave The single pitch class that symbolizes Wozzeck's idée fixe in the murder scene is first asserted in this connection as the final note of Act II … — George Perle, The Operas of Alban Berg, 1989 —usually hyphenated when used before another noun pitch-class sets —called also chroma
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First Known Use of pitch class
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