1908- . US composer. His early music shows
the influence of Stravinsky, but after 1950
it became increasingly intricate and densely
written in a manner resembling Ives. He
invented `metrical modulation' which allows
different instruments or groups to stay in
touch while playing at different speeds. He
has written four string quartets, the
Symphony for Three Orchestras 1967, and the
song cycle A Mirror on Which to Dwell 1975.