Update the OP with the
full list of songs and even the first batch of DLC songs, too.
New Songs for the List:
All-American Rejects - Move Along
Black Tide - Show Me the Way
Dead Kennedys - Holiday in Cambodia
Jethro Tull - Aqualung
Jimmy Eat World - The Middle
Lacuna Coil - Out Truth
Lamb of God - Laid to Rest
Lit - My Own Worst Enemy
Lush - De-Luxe
Mighty Mighty Bosstones - Where'd You Go?
Motorhead - Ace of Spades
The Offspring - Come Out and Play (Keep 'em Separated)
Rush - The Trees
Siouxsie & the Banshees - The Killing Jar
Smash Pumpkins - Today
Social Distortion - I Was Wrong
Soundgarden - Spoonman
DLC:
30 Seconds to Mars - The Kill
Belly - Feed the Tree
Disturbed - Inside the Fire
Lynyrd Skynyrd - Gimme Three Steps
Muse - Hysteria
Mute Math - Typical
No Doubt - Just a Girl
Oasis - Wonderwall
Paramore - Crushcrushcrush
Red Hot Chili Peppers - Under the Bridge
I can't say I'll be buying any of the DLC, so I'll wait for further releases for any new songs I'd buy.