I found this on team Xbox's website, and the list of songs is as follows:
“Ain't Talkin Bout Love”
“And The Cradle Will Rock”
“Atomic Punk”
“Beautiful Girls”
“Cathedral” (solo)
“Dance The Night Away”
“Eruption” (solo)
“Everybody Wants Some”
“Feel Your Love Tonight”
“Hang ‘Em High”
“Hear About It Later”
“Hot For Teacher”
“Ice Cream Man”
“I'm The One”
“Jamie's Cryin”
“Jump”
“Little Guitars”
“Loss Of Control”
“Mean Street”
“Panama”
“Pretty Woman”
“Romeo Delight”
“Running With The Devil”
“So This Is Love”
“Somebody Get Me A Doctor”
“Spanish Fly” (solo)
“Unchained”
“You Really Got Me”
Cathedral is one of my favorite songs; I'd love to try my hand at that one on Guitar Hero! As a "real" guitar player, I know how hard Van Halen's songs are to play. I bet I'd have to play all of these songs on the easiest level...