Harmonix and MTV Games announced that five new tracks are available for download in the Rock Band Unplugged in-game music store for the PSP. This latest update brings another wide variety of musical genres to the game, including country music trio The Dixie Chicks, electric blues guitarist Stevie Ray Vaughan and alternative rock groups R.E.M. and The Pixies. These additions bring the current total number of songs available in the Rock Band Unplugged music store to 19.