I discovered Divisi quite some time ago and now I've heard another of their songs on Pitch Perfect Blog via an NPR podcast and I must say, I'm still digging their groove. Not only that, I think acappella is a true form of musical art that involves intense coordination and some excellent skill unlike the crap that pass for music today.

Anyway, check out this unbelievable performance of Usher's "Yeah" by Divisi:

Find some local groups at a university near you and go get some good old entertainment:

Collegiate-Acappella