I know of just one song, but are there other songs out there?
James Dempsey and the Breakpoints do a song every year at WWDC. Knowing the secret to which session will have the song requires knowing some very subtle clues to watch for in some of the Monday sessions.
Besides "Model View Controller" (2003), there's been:
Sorry I can't find all of the videos.
There are also comical songs about Mac OS X.
There is now an entire album of songs about OS X and iOS development.
The album is Backtrace.
It contains all of the James Dempsey and the Breakpoints songs listed above plus additional materials.
It's available now on iTunes:
I hope you enjoy it!