Rock Band has arrived on the iPhone, complete with a Bluetooth multi-player mode that allows four people to jam together. The $9.99 app, also available on the iPod Touch, includes 20 tracks, among them the Pixies' "Debaser" and two Foo Fighters songs; of course, more can be purchased via an in-game store, TechCrunch reports. All four parts of the popular video game—drums, bass, guitar, and even singing—are played by tapping on the screen. (More iPhone stories.)