Stephen Michael Reich ( born October 3, 1936) is an American composer known for his contribution to the development of minimal music in the mid to late 1960s.Reich’s work is marked by its use of repetitive figures, slow harmonic rhythm, and canons. Reich describes this concept in his essay, “Music as a Gradual Process”, by stating, “I am interested in perceptible processes. I want to be able to hear the process happening throughout the sounding music.” To do so, his music employs the technique of phase shifting, in which a phrase is slightly altered over time, in a flow that is clearly perceptible to the listener. His innovations include using tape loops to create phasing patterns, as on the early compositions It’s Gonna Rain (1965) and Come Out (1966), and the use of simple, audible processes, as on Pendulum Music (1968) and Four Organs (1970). The 1978 recording Music for 18 Musicians would help entrench minimalism as a movement. Reich’s work took on a darker character in the 1980s with the introduction of historical themes as well as themes from his Jewish heritage, notably Different Trains (1988).

Reich’s style of composition has influenced many contemporary composers and groups, especially in the United States. Writing in The Guardian, music critic Andrew Clements suggested that Reich is one of “a handful of living composers who can legitimately claim to have altered the direction of musical history”.

Reich was born in New York City to the Broadway lyricist June Sillman and Leonard Reich. When he was one year old, his parents divorced, and Reich divided his time between New York and California. He is the half-brother of writer Jonathan Carroll. He was given piano lessons as a child and describes growing up with the “middle-class favorites”, having no exposure to music written before 1750 or after 1900. At the age of 14 he began to study music in earnest, after hearing music from the Baroque period and earlier, as well as music of the 20th century. Reich studied drums with Roland Kohloff in order to play jazz. While attending Cornell University, he minored in music and graduated in 1957 with a B.A. in Philosophy.