Well now that the final setlist is out for GHWT I just want to list the ones I think will be good to play aswell as songs I like from bands I like, so here goes:
(Ones in bold are songs I like from bands I like and the others are ones I think will be good to play for all instuments)

30 Seconds To Mars - “The Kill”
Beastie Boys - “No Sleep Till Brooklyn”
Billy Idol - “Rebel Yell”
Black Label Society - “Stillborn”
Blink-182 - “Dammit”
Bullet For My Valentine - “Scream Aim Fire”
Dream Theater - “Pull Me Under”
Foo Fighters - “Everlong”
Korn - “Freak On A Leash”
Lacuna Coil - “Our Truth”
Linkin Park - “What I've Done”
Lost Prophets - “Rooftops (A Liberation Broadcast)”
Lynyrd Skynyrd - “Sweet Home Alabama (Live)”
Mars Volta - “L'Via L'Viaquez” - Will be an AWESOME SONG to play!!!
Metallica - “Trapped Under Ice”
Michael Jackson - “Beat It” - Finally theres some MJ love in GH.
Muse - “Assassin”
Ozzy Osbourne - “Crazy Train”
Ozzy Osbourne - “Mr. Crowley”
Rise Against - “Re-Education Through Labor”
Survivor - “Eye of the Tiger"
System of a Down - “B.Y.O.B.”
Tool - “Parabola”
Tool - “Schism”
Tool - “Vicarious”
Van Halen - “Hot For Teacher” - Could be the hardest song for guitar or close with the Statriani song.
Zakk Wylde’s Original Guitar Duel Recording - Cant wait to hear what hes recorded for the game.

For DLC the new Metallica Death Magnetic will be playable in World Tour which is a pretty sweet album and from the youtube videos ive seen are awesome to play, so I will be purchasing that when I buy this game. I will be getting the whole setup btw (Drums, Mic, Guitar & The game)