Harmonix and MTV Games have announced that a three pack of tracks from Nirvana, a four pack of tracks from Foo Fighters and a single from Joan Jett & The Blackhearts will be added next week to the Rock Band Music Store and the LEGO Rock Band Music Store.

Tracks from Bullet for My Valentine and System of a Down will be available for download next week for Rock Band Unplugged on PSP.

Nirvana released their debut album, Bleach, in 1989 on Sub Pop Records, and to celebrate the 20th anniversary of this platinum-selling album, Sub Pop will release a special edition of the album, featuring a complete and previously unreleased live concert recorded in 1990 in Portland, Oregon. The anniversary edition of Bleach will be released the same day and date as "Nirvana Bleach Pack," which includes "About a Girl," "Blew" and "School."

American rockers Foo Fighters, will release Greatest Hits Nov. 3, the same day the third DLC pack from the band will be available in the Rock Band Music Store. Greatest Hits will feature 14 of the three-time Grammy Award-winning band's most-loved songs, as well as two new songs, "Wheels" and "Word Forward," both of which are featured in "Foo Fighters Pack 03," along with "Best of You" and "The Pretender."