It's by the Icelandic band Sigur Ros. I'd had one of their albums on my iPod for a little while now, but never really gave it a fair shake. I suppose that's what happens in the age when you can download so much music in such a short amount of time-- some stuff is bound to fall through the cracks.
Anyway-- give this one a listen because it'll make you feel good and hopeful, and all that. At least that's what it does for me, and trust me-- I can use that.
And here is the trailer for "Earth."