RHYTHM - Sonic action in time or the arrangement of durational sonic patterns or tone lengths that fall on or between a "beat".

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Modern rhythm used by series of tones in time
Modern rhythm may have temporal unit beat
Modern rhythm has basic skeleton modern meter
Modern rhythm is sonic action in time
Modern rhythm is component of modern tonality
Modern rhythm expresses emotion
Modern rhythm has assignment serialism
Modern rhythm is element of Modern Music
Modern rhythm is element of Modern melody