Amon Amarth guys (several times)
Peter Tägtgren (Hypocrisy, Pain)
All of Dark Tranquillity
Mikael Åkerfeldt of Opeth (about 5 times)
Bruce Dickinson
All of Gamma Ray
All of Entombed
Matti & David from Dismember (2 times)
Tomas & Patrik from Thyrfing (3 times)
Marco Aro, Jonas Björler & Patrik Jensen from The Haunted
Tomas Lindberg ex-At The Gates
Mårten Hansen Sins of omission, ex-A canarous quintet
Leif Edling, Mats Björkman from Candlemass
Sharlee D'Angelo, Mike Amott from Arch Enemy
Lord Ahriman from Dark Funeral
Jesper from In Flames
All of The Crown
Jocke from Necrophobic
A couple of the guys from Undercroft
Everyone from HammerFall except Anders
Frost & Satyr of Satyricon
Patrik Wiren, ex-Misery loves company
All members of Amaran (famous?
)
All of Blind Guardian