Oh dear, this is good. Bon Iver plays "Perth" with The Roots. Gorgeous. For haters of the abuse of autotune (like me), this is how you take someone with a really good voice and use autotune to tweak the feel of a voice/song for the art of it, rather than to use it to make people think you are a better singer than you are. This is also how you take the already-awesome of a song and make it more awesome...play with The Roots. After watching, go buy Bon Iver, Bon Iver. I'm not sure how you can resist!