http://www.youtube.com/watch?v=h7BItUbUZ_M

Whether you're a fan of My Chemical Romance or not, this dude plays a cool rendition of the song all by himself--several violin parts with piano backup. He's got other famous songs up as well. I'm impressed by his ability to keep a steady rhythm (I've tried something like this before and found it difficult), and he balances the harmonies very well. There are only a bazillion instrumental covers of everything on YouTube these days, but this one stood out to me.