Invocation (1957) (2:20) opens with a trio of three recorded sounds, played on the Multi-track at the speed at which they were originally recorded: a breaking pane of glass, a ping-pong ball hitting the bat, and the water drop from Dripsody. Changes in playback speed soon follow. The words “concrète rock” are pencilled on a page of the score.
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Also part of Compositions Demonstrations 1946-1974 .