Duality is at once sacred and playful. It is both dark and light, organic and refined, masculine and feminine. Dead Can Dance's Lisa Gerrard partners with Pieter Bourke, formerly of Aussie band Eden, to create this compositional dance of partnership that is classical, ancient, and thoroughly modern. Gerrard's voice is multitracked at times, conjuring a cathedral choir and the droning chants of monks. Drums and synth snake from desert to brilliant stormy sky to shaking earth and the bodies that inhabit those spaces. There are lush multiple layers of strings, bagpipe drone, and, quite literally, the laughter of children. The vocals sans "real" words and multicultural instrumentation will be familiar to Dead Can Dance listeners. Yet there is something more exclusive, more womblike about the music of Bourke and Gerrard; rather than two distinct bodies making music, like mother and in utero child sharing blood and breath, they are mutually dependent.