Sam Totman (x2) and Vadim Pruhzn__ from DragonForce.
The singer from a great power metal band called Sabaton.
The frontman, guitarist and drummer from Black Stone Cherry.
Chris Batten, bassist from Enter Shikari.
Pete Waterman x2
Wolf from Gladiators
I thnk that's it.
EDIT - forgot Jerry Cantrell from Alice In Chains.