That playlist-per-track idea is absolutely brilliant! I actually had that idea a while back, but i obviously don't have a game to implement that into.

A song I'd like to suggest, since it was said on the Facebook page that the game was going for a slightly retro-future look, is Varien and Razihel's "Toothless Hawkins and His Robot Jazz Band." It's a blend of 1920's big band jazz and modern dubstep/dance music, which would probably suit a nighttime race through a Las Vegas-style city perfectly.
