Minimalist pioneer Terry Riley was among the most revolutionary composers of the postwar era; famed for his introduction of repetition into Western music motifs, he also masterminded early experiments in tape loops and delay systems. Deeply influenced by the mantra-like repetition of Indian classical music as well as the modal and microtonal scales and jazz improvisation, compositions such as 1964's In C and electronic recordings like 1969's A Rainbow in Curved Air became landmarks of 20th century music, greatly influencing developments in electronic music and psychedelic/prog...