Confirmed line-up so far for Back to the Beginning:
Black Sabbath
Metallica
Slayer
Pantera
Gojira
Halestorm
Alice In Chains
Lamb Of God
Anthrax
Mastodon
Steven Tyler
Guns N' Roses
Rival Sons
Tool
Billy Corgan (The Smashing Pumpkins)
David Draiman (Disturbed)
Duff McKagan (Guns 'N Roses)
Slash (Guns 'N Roses)
Fred Durst (Limp Bizkit)
Jake E Lee
Jonathan Davis (Korn)
KK Downing
Mike Bordin (Faith No More)
Rudy Sarzo
Sammy Hagar
Jason Momoa
Chad Smith (Red Hot Chili Peppers)
Scott Ian (Anthrax)
Sleep Token ii (Sleep Token)
Vernon Reid (Living Colour)
Papa V Perpetua (Ghost)
Soundgarden
Tom Morello (Rage Against The Machine)
Wolfgang Van Halen
Zakk Wylde
Dave Ellefson (formerly of Megadeth)
Whitfield Crane (Ugly Kid Joe)
Andrew Watt