These voices are like no choir you ever heard. They can form pale clouds of sound, or pools of glowing light, or bright shafts of pure sound. Phrases can soar before suddenly reversing direction and travelling backwards, but along a different tangent. Rising from the luminous sound beds — sometimes lush, sometimes austere – float a disembodied melody from an ancient world, an overheard conversation, a whisper from the past, the rumblings of a distant storm, the babble of children, or something that sounds like the ambient chatter of an asteroid belt.

– Richard Williams