Halo theme performed live
A friend sent me this link, and at first I thought that the premise was kind of nerdy, but when I played the video, before long I was thrashing away on the air guitar I keep next to my desk specifically for opportunities like this.
Even though Halo was far from being without faults, few can argue the phenomenon that it has become. Plus, it had one hell of a soundtrack, and this is a pretty cool rendition of the theme. The chick on the violin is awesome