It is Apocalyptica's cover of Metallica's "One", and one of my favorites. Loved it!
I was in LA for the USC game, and that intro was very well done as well, gave me goosebumps; that's what you get with such quality film and theater programs that USC has - actually I loved everything about the USC experience except for the fact that their band (which is great otherwise) plays the same two songs (fight on and fanfare) way, way too many times. It is basically those two songs and some popular songs. I love the fact that we play so many songs which are unique to the U.