An early masterpiece from the young Terry Riley – a work that's a bit different than some of his more solo or small group outings – but one that really sets the stage for all of Riley's experiments in years to come! The premise here is very unusual – in that the "score" features 53 separate short musical passages – which are then to be played in an order defined by the musicians themselves, in shifting patterns of repetition, moving in and out of phase with a really otherworldly quality – ever shifting, turning, and drifting – all to create a remarkable tapestry of sound, texture, and melody. This recording of the work is still the best, and it was produced with excellent care by David Behrman – and features musicians who include Jon Hassell on trumpet, Edward Burnham on vibes, Jan Williams on marimbaphone, David Shostac on flute, and Margaret Hassell on "The Pulse". CD