The creators of Argyle and Crew did an excellent job of picking out some Creative Commons-licenced music that helps capture the feel of the land of Skcos! Wonderfully fun, age appropriate, and very inspirational.
This is a very impressive collection of music. Each of these pieces would work fine as the "theme song" for the right kind of campaign. Most of them are on the modern/spacey/techno side but could be used for any genre with the right spin. I'm surprised this is free. I'd happily pay $5 or more.