Harmonix and MTV Games have announced four new tracks available for download in Rock Band Unplugged for the PSP. These four tracks join the 10 already released at launch via the Rock Band Unplugged in-game music store.

This latest selection of songs spans a variety of genres, including alternative rock mainstays Stone Temple Pilots, '80s hair metal stalwarts Mötley Crüe, modern metalcore outfit Avenged Sevenfold, and progressive metal pioneers Dream Theater.

Rock Band Unplugged players can simply sign in to the in-game music store and purchase and download new tracks straight through the PlayStation Network on their PSP. Players can also purchase the tracks via the PlayStation Network Store on their PC and then download them to their device.

Tracks:

Avenged Sevenfold, Afterlife

Dream Theater, Constant Motion

Mötley Crüe, Dr. Feelgood

Stone Temple Pilots, Sex Type Thing