You guys gotta check this out. It's a band called the Travel Bugs that have a CD for sale on Groundspeak's shop. All of their songs are geocaching related. This link will take you to the audio clips.
They're kinda quirky in a garage-band sorta way, but pretty funny. Might make an interesting gag gift for a caching friend this Christmas.
In addition, they've released Travel Bugs travel bugs (that's not a typo) for each member of the group and you can track where each one is through their website.