This rendition of the song "Misty Mountains Cold: from Peter Jackson's The Hobbit is the greatest ever. The iconic Dwarven song was done by the Auralnauts, and you have to listen to it. I'd go into more details, but this is one of those things I don't want to ruin the surprise for. Enjoy! Thanks to Nerd Basterds for the heads up on this awesomeness.