Searching for music-releated Keynote Themes

I have to create a Keynote '09 program that has to do with the history of Classic Rock; while I could create it well enough with the standard themes, I was wondering if anyone knows of some themes out there that would have a 'music feel' to them?

Alternately, I'm thinking I could try to do something based around the concept of album covers, which means I'd be dealing with a lot of square graphics - which led to the thought - are there any themes out there that are square-shaped, say 768x768, as opposed to the standard 1024x768 rectangle? I bet not, but it's worth asking.