Theres a few pieces of music played, Most notably in South Park (the episodes Damien and Britneys New Look. Maybe more, but these are the only ones I can remember).
A piece of music is also played on this website:
http://www.Your.Name.Here.youaremighty.com/

I'm pretty sure they're in latin? It's similar to this, but not exactly the same.
http://uk.youtube.com/watch?v=lF7_PhB9coo


Please someone help.
(Now that I've typed this it seems like a stupid question xD)