How good are you atJUN 20 2001

How good are you at Name That Tune? A while back, I downloaded a song from Napster that I thought was a track from Radiohead's upcoming album. It didn't sound much like Radiohead, but I kept it anyway because it was catchy and I liked it. Now that Amnesiac has been released and I know that this mystery track isn't on there, I'm wondering who this bit of music belongs to. MP3 removed to help with the server load. Sorry.

Update: mystery solved. The song is Ny Batteri off of Agaetis Byrjun by Sigur Ros. Thanks to Kelly for the help.