Rock Band Weekly: Nirvana 4-pack, 10 pro guitar upgrades

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)

• "Heart-Shaped Box" (160 MSP / 200 WP / $1.99)*

• "Rape Me" (160 MSP / 200 WP / $1.99)

• "All Apologies" (160 MSP / 200 WP / $1.99)

• "You Know You're Right" (160 MSP / 200 WP / $1.99)

Nirvana tracks adding for Pro Guitar/Bass upgrades*

• "Smells Like Teen Spirit"

• "Breed"

• "Polly"

• "Territorial Pissings"

• "Lounge Act"

• "Stay Away"

• "On a Plain"

• "Something in the Way"

• "Lithium (live)"

• "Come As You Are (live)"

*Pro Guitar/Bass expansion available (80 MSP / 100 WP / $0.99)