If you have no idea what this is, you're obviously not an American Idol watcher. If you're interested to see what it came from, though, here's a link to the original audition and also his reappearance at the American Idol finale (complete with a full marching band).
This video doesn't actually feature the original guy, but a band who put together a MUCH better version of his cheesy song, and made an even cheesier video to go along with it.