Webern's Five Orchestral Pieces and Terry Riley's In C demonstrate the postwar avant-garde's efforts to explore:

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Both Webern's Five Orchestral Pieces and Terry Riley's In C explore contrasting perceptions of time and rhythm. Webern uses complex rhythmic structures and irregular time signatures while Riley's piece is based on a repeating rhythmic pattern that allows for individual interpretation and variation among the performers. Neither work focuses on electronic music, serialization, or chance music.

Webern's Five Orchestral Pieces and Terry Riley's in C Demonstrate