In the compositional technique phasing, the same part is played on two musical instruments , in steady but not identical tempo. Thus, the two instruments gradually shift out of unison, creating first a slight echo as one instrument plays a little behind the other, then a doubling with each note heard twice, then a complex ringing effect, and eventually coming back through doubling and echo into unison.
Clapping Music (1972) was Steve Reich’s attempt to write a piece of music requiring nothing but the human body.
