Tenacious D, which if you did not already know, is composed of two members, one being Jack Black (yes-the actor), and Kyle Gass. There really is no one like these guys out there, nor main stream comedy bands in general. If you are looking for a creativity these guys do not fall short. All of there songs are very different, each following a funny and unique theme. There is also some impressive instrumentation and catchy guitar riffs throughout the CD.
Lonely Island, System of a Down