Simultaneity succession
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In music and music theory a simultaneity succession is a series of different groups of pitches or pitch classes, each of which is played at the same time 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.