Steve Reich is one of the most important composers of the 20th and 21st centuries. A leader in developing and popularizing what many describe as minimalist music — but which Reich has often preferred to describe as music that unfolds over a gradual process — his music helped reassert the value of tonality and sonority within newly composed concert music and influenced generations of musicians. In this episode, Reich recalls the first time he heard the music of French medieval composer Pérotin, without whose influence some of his music “never would have happened,” and he reflects on why early music sounds so fresh to contemporary ears. The recording of “Viderunt Omnes” featured on this episode was performed by The Hilliard Ensemble on the 1989 ECM New Series album, “Perotin.”