UC Berkeley's a cappella group DeCadence found two guys boxing training in Central Park, New York, and on the spur of the moment, decided to provide a little background music: Hit play or go to Link [YouTube] - via Fazed
Ok, admittedly, I was a little harsh on them at first, too, then I considered the acoustic nightmare of trying to sing a capella with a group in open air with that much distance between members. Of course there's going to be better on CD.
I was expecting Rocky, too.
Still, not bad from an impromptu gig. I'm sure would be cooler if you were there and it just happened. :D