A member on a different forum as apparently leaked a bunch of un-announced songs that might be playable for rock band. (Harmonix hasn't confirmed it yet)
Here is a new list from Nirvana:
"Breed"
"Come As you Are"
"Lithium"
"Lounge Act"
"On a Plain"
"Polly"
"Smells Like Teen Spirit"
"Stay Away"
"Territorial Pissings"
"Something in the Way"

Before we get to the list, we should point out that these songs have not been confirmed by Harmonix, and there's no guarantee any will ever actually make it to the Xbox Live Marketplace and PlayStation Network. It's also worth noting that the list contained only song titles with no artists attached. Joystiq took it upon themselves to match the original (or most likely) artists for every song, and we now present to you their list:

Blur

* "Beetlebum"

Def Leppard

* "Hysteria" (could also possibly be by Muse)

Foo Fighters

* "D.O.A."

Garbage

* "Why Do You Love Me?"

Grateful Dead

* "Alabama Getaway"
* "Casey Jones"
* "China Cat Sunflower"
* "Franklin's Tower"
* "I Need a Miracle"
* "Sugar Magnolia"
* "Truckin'"

Iron Maiden

* "Wrathchild"

Jonathan Coulton:

* "Still Alive"

Nirvana

* "Breed"
* "Come As you Are"
* "Lithium"
* "Lounge Act"
* "On a Plain"
* "Polly"
* "Smells Like Teen Spirit"
* "Stay Away"
* "Territorial Pissings"
* "Something in the Way"

Oasis

* "Rock n' Roll Star"

The Rolling Stones

* "Brown Sugar"
* "(I Can't Get No) Satisfaction"

The Smashing Pumpkins

* "Zero"

Stone Temple Pilots

* "Sex Type Thing"

Tokio Hotel

* "Through the Monsoon"

Weezer

* "El Scorcho"

The Who

* "Behind Blue Eyes"
* "Pinball Wizard"

SSJ3 Trunks via 1up.com »