Harmonix and MTV Games have announced four new tracks available for Rock Band Unplugged for the PSP. These four tracks, which can be downloaded through the PSN for $1.99 each, 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.

Tracks: 
Avenged Sevenfold “Afterlife”
Dream Theater "Constant Motion"
Mötley Crüe "Dr. Feelgood"
Stone Temple Pilots "Sex Type Thing"