“Four Organs” is the ultimate minimalist composition. Performed by Reich, Glass, Art Murphy and Steve Chambers, four identical Farfisa organs strike a single chord and gradually lengthen each note to produce polyrhythms between the players. Anchored by Jon Gibson’s stoically-steady pulse on maracas, the piece deconstructs its opening burst to a sustained mass of sound stretching the tones to create (in Reich’s words) “slow-motion music.”

Inspired by Reich’s early training on drums, “Phase Patterns” treats the keyboards like tuned percussion instruments: a basic rhythm pattern is played in unison and almost imperceptibly increases tempo to move out-of-sync. Each progressive cycle emphasizes unique figures that are not generated by an individual alone, but rather emerge from the communal expression of the group.

Originally released on Shandar in 19