Arvo Part creates music of deceptive simplicity, and listening to his work can be a transformative experience. Imagine taking your ears on a retreat, and you're some way to understanding why his work is so popular. The Estonian composer underwent his own transformation in the 1970s, having explored dense avant-garde music in the early part of his career. He put himself through an eight-year creative exile, and emerged with a new, purer voice. The Arvo Part that many people are devoted to today (including R.E.M.'s Michael Stipe and Bjork) creates music that cleanses. A sonic detox.