Metallica:

All Nightmare Long
Battery
Creeping Death
Disposable Heroes
Dyers Eve
Enter Sandman
Fade To Black
Fight Fire With Fire
For Whom The Bell Tolls
Frantic
Fuel
Hit The Lights
King Nothing
Master of Puppets
Mercyful Fate (Medley)
No Leaf Clover
Nothing Else Matters
One
Orion
Sad But True
Seek And Destroy
The Memory Remains
The Shortest Straw
The Thing That Should Not Be
The Unforgiven
Welcome Home (Sanitarium)
Wherever I May Roam
Whiplash

Others:

Alice In Chains - No Excuses
Bob Seger - Turn The Page
Corrosion of Conformity - Albatross
Diamond Head - Am I Evil?
Foo Fighters - Stacked Actors
Judas Priest - Hell Bent For Leather
Kyuss - Demon Cleaner
Lynyrd Skynyrd - Tuesdays Gone
Machine Head - Beautiful Mourning
Mastodon - Blood And Thunder
Mercyful Fate - Evil
Michael Schenker Group - Armed and Ready
Motorhead - Ace of Spades
Queen - Stone Cold Crazy
Samhain - Mother of Mercy
Slayer - War Ensemble
Social Distortion - Mommy's Little Monster
Suicidal Tendencies - War Inside My Head
System of a Down - Toxicity
The Sword - Black River
Thin Lizzy - The Boys Are Back in To

Also, for those of you who bought the Death Magnetic Track Pack for 360/PS3, you will be able to play those as well.