Arvo Pärt: "De Profundis"
Very slow, contemplative vocal pieces, performed here by Paul Hillier's Theatre of Voices. Extremely consciousness-altering. These pieces, chosen from various sections of Arvo's career, build a cathedral in your listening space. His Passio (not included in this collection; it's a CD unto itself) is one of the most amazing pieces of devotional music I've ever heard. If the Deis Irie doesn't give you serious chills, nothing will. What CDNow has of his is available "here", but you're better off with "ECM" and "Harmonia Mundi".