Just a single suggestion.

[Tr00berduck]

Looking through peoples suggestions, there isn't much variation as far as slightly more obscure bands go, so I think Clutch - Electric Worry would be a fantastic addition to the game.

Not to mention that if the game DID include Clutch, I would surely buy it just for that.

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[chuchillo]

Really good song... surprised I've never heard of them before... would be good for Rockband as a high energy early tier song just b/c it's somewhat repetitive...

[Tr00berduck]

You should check out their latest album (Beale Street to Oblivion) and Robot Hive/Exodus.

Great band, like I said they're not mainstream in the slightest, but should be a good band to throw into the game due to the fact they're more obscure and damn well need more exposure!