Via the Java Posse podcast, I heard a great song called Code Monkey. I just wanted to make a general statement that the author and musician, Jonathan Coulton, is hilarious and he is doing something really interesting. It seems that he is creating a new song each week. He has a podcast called "Thing a Week".
Go here to see all of the work he had done and support him. You can hear any song he had done there as well as buy the songs or view the lyrics. All of Jonathan Coulton's music is released under the creative commons license.
The Jonathan Coulton Project is a group that takes these songs and makes music videos. They seem to be under a similar license. So far there are five videos available in both mp4 and wmv formats.