Stephen Michael Reich (/ˈraɪʃ/; born October 3, 1936) is an American composer who, along with La Monte Young, Terry Riley, and Philip Glass, pioneered minimal music in the mid to late 1960s.His innovations include using tape loops to create phasing patterns (for example, his early compositions It's Gonna Rain and Come Out), and the use of simple, audible processes to explore musical concepts (for instance, Pendulum Music and Four Organs).