Definitve Jux (an independent hip hop record label) teamed up with Cartoon Network's "Adult Swim" to put this mixtape together. It has a collection of songs on it by Def Jux artists such as Rob Sonic, Mr. Lif, El-P, etc.
I think they did a really good job putting it together. It is also a FREE download at the Definitive Jux website. If you are into hip-hop not infused with the typical "money, cash and drugs" format, this would be a great add to your music collection.
http://store.definitivejux.net/store/index.htm
