Terrence Mitchell Riley (born June 24, 1935) is an American composer and performing musician best known as a pioneer of the minimalist school of composition. Influenced by jazz and Indian classical music, his music became notable for its innovative use of repetition, tape music techniques, and delay systems. He produced his best known works in the 1960s: the 1964 composition In C and the 1969 LP A Rainbow in Curved Air, both considered landmarks of minimalism and important influences on experimental, rock, and contemporary electronic music.