The Hexachord reference article from the English Wikipedia on 24-Apr-2004
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Hexachord

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In music, especially in musical set theory, a hexachord is a collection of six pitch classes, often one of two ordered hexachords in a tone row or set form. Hexachords may be used to create invariance and combinatoriality, and often a melody and its accompaniment will be drawn from different hexachords.

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