*PLEASE HELP* What song is this? (Slow Instrumental)?

What song is being played in the background of this video? I really
love it, and I rarely love songs. I think it might be by Sigur Rós
but I do not know the title.

http://www.youtube.com/watch?v=xOUEq437-xU

Thank you.
@ Megan Ward- That song is not even close.....