Here, have some video awesome. This is the Australian comedy group's Axis of Awesome performing "Four Chord Song." There is apparently more at
http://axisofawesome.net but I haven't looked there, yet, because I have to do stupid things like scrub green paint out of my hair before going to work.

Brief 1-second profanity near the end if you're listening at work. (Slackers!)

http://www.youtube.com/watch?v=5pidokakU4I