Four Chords, 36 Songs

I saw this posted on Dan Castady's facebook and thought it was pretty cool. So, I thought I'd share it as well:

http://www.facebook.com/ext/share.php?sid=126693415857&h=RErff&u=BQ_eE

O.K. so some of the vocals get a little crazy, but you have to admit it is a pretty good demonstration.