Riley is one of the founders of Minimalism. His music tends to be for soloist (usually himself) playing a barrage of electronic instruments. The works on this disc hail from the mid-seventies, when Riley began to dabble with Eastern modalities, mostly Indian ragas that strive for swara, a transcendental state reached through perfect pitch. Along the way, notes will clash and (to our ears) sound like performance mistakes. These are the product of Riley's overlapping Eastern modalities with Western modalities, often in the same measure. Riley travels farther afield in his music than other Minimalists do, but it's worth the journey. --Paul Cook