The Simultaneity succession reference article from the English Wikipedia on 24-Jul-2004
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Simultaneity succession

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In music and music theory a simultaneity succession a series of different groups of pitches or pitch classes, each of which is played at the same as the other pitches of its group. Thus, a simultaneity succession is a succession of simultaneities. Simultaneity succession is a more general term than chord progression or harmonic progression: not all simultaneity successions are harmonic progressions but most chord progressions are simultaneity successions.

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