The developer is touting the game as a "completely new approach" to music games since it hands you, right off the bat, a sandbox of sorts to play around in. Basically, you can set yourself up with any of the licensed tracks in the game and remake, redo, remix, and otherwise 'jam' right along side said track. It's a pretty neat idea and one that actually does do something different with a game type that lives and dies with strumming to colors.
JAM might be just the thing for fans who've pretty much burned themselves out on the genre too. The game launches for both the PSN and the Xbox Live Arcade the week of May the 16th.