This video is part of a full set, performing their album In Rainbows. You can buy the video album on iTunes. A delightful way to listen.

This isn't new, but I find I return to watch it often enough that I ought to share it with those who maybe haven't seen it at all.

In this video, Imogen Heap, an artist of sorta electronic pop music, performs one of her songs totally live and a cappella, laying down tracks and basically singing a really cool round with herself. Check it out: