Rock Band "celebrates the twentieth anniversary" of Nirvana's Nevermind album next week by releasing four tracks off ... a different album. Three of the DLC songs are from the band's In Utero album, and the other is "You Know You're Right." Plus: There ten Nirvana pro guitar/bass upgrades.
Xbox 360 / Wii / PS3
Available: September 20, 2011
Celebrating Nirvana Pack (700 MSP / 700 WP / $6.99)