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2017
Kobi Farhi (Orphaned Land
Jon Leon (White Wizzard)
James Cassells (Asking Alexandria)
Mike Tarlazzi (Black Wail)
Daniel Hakansson (Diablo Swing Orchestra)
Alex Bosson (Lunar, Helion Prime)
Steve Tucker (Morbid Angel)
Johan Norrby (JoNo)
Derek Engemann (Cattle Decapitation, Scour)
Wills Weller (Toothgrinder)
Kevin Keegan (Dead Quiet)
Max Cavalera
Tarja
Angel Vivaldi
Jeff Teets (Mindmaze)
Mike Mills (Toehider)
Jani Liimatainen (Cain's Offering, The Dark Element)
Jeff Scott Soto
Derek Davis (Babylon A.D.)
Fabio D'Amore (Serenity)
Michael Sweet (Stryper, Sweet & Lynch)
Matt Young (King Parrot)
Tzmani
Carmine Appice
Atony Ellis & Matt Avery (Bigfoot)
Robin Staps (The Ocean, Pelagic Records)
Phil Lewis (LA Guns)
Then Comes Silence
Jesper Stromblad & Jake E ( Cyhra)
Matt Harvey (Exhumed, Expulsion, Gruesome, Pounder)
Ethan McCarthy (Primitive Man)
Marc Motley (The Arson Choir)
Pete Dee (The Adicts)
Sara Coda (Silent Rival)
Blothar The Barbarian (GWAR)
Bob Kulick
Johan Carlsson (Sparzana)
Dawson Scholz (The Ongoing Concept)
Paul Mazurkiewicz (Cannibal Corpse)
Christoph (Tiger) Bartelt (Kadavar)
Anneke van Giersbergen
Schmier (Destruction, Panzer)
Seamus Menihane (Vattnet, Vanna, Astronoid)
Mark Briody (Jag Panzer)
Lee Dorian (With The Dead, ex-Napalm Death, ex- Cathedral)
Brock Lindow (36 Crazyfists)
Matt Weed (Rosetta)
Buried Above Ground
Louis James (Dirty Thrills)
Nigel Dupree (Wayland)
Dani Filth (Cradle of Filth)
Trevor Strnad (The Black Dahlia Murder)
Helmuth Lehner (Belphegor)
Adrian Patrick (Otherwise)
Bobby Blitz (Overkill)
Steve Zetro Souza (Exodus)
Timmy Rough (The New Roses)
Andrew Neufeld (Comeback Kid)
Witherfall
Bruce Corbitt (Warbeast)
Greg Mackintosh (Paradise Lost, Vallenfyre)
Sami Hinkka (Ensiferum)
Frankie Banali (Quiet Riot)
Brian Slagel (Metal Blade Records)
Max Portnoy (Next To None)
Christian Lindell (Portrait)
Baard Kolstad (Leprous, Borknagar)
Rex Cox (Uncured)
Anna Murphy (Cellar Darling, ex-Eluveitie)
Matt Olivo (Expulsion, Repulsion)
Dale Crover (The Melvins, Altamont, solo)
Marcus Jidell (Avatarium, Soen)
Crimfall
Josh Todd (Buckcherry, Josh Todd & The Conflict)
Jason Keyser (Origin)
Siamese
Dwid Hellion (Integrity)
James Harwell (Bison)
Nick Brophy (Riverdogs, Nashville songwriter, producer, engineer)
Dan Tompkins (TesseracT)
Erik Larsson (Apocalypse Orchestra)
Michael Monroe (ex- Hanoi Rocks, solo)
Spencer Weidner (Starkill)
Hansi Kursch (Blind Guardian)
Dirk Sauer (Edguy)
O.J. Ojeda (Byzantine)
Billy Milano (M.O.D., ex- S.O.D.)
Will Shaw (Ayreon, Heir Apparent)
Stu Block (Iced Earth, ex- Into Eternity)
Trey Williams (Dying Fetus)
Vincent Bennett (The Acacia Strain)
Jorn Lande
Manuel Gagneux (Zeal and Ardor)
Pat Power (Dream Evil)
Mike Miczek (Broken Hope)
Levi Benton (Miss May I)
Magnus Karlsson (The Ferrymen, Free Fall, Primal Fear, Allen/Lande)
Dan Cavanagh (Anathema)
Aldo Lonobile (Secret Sphere)
Nathan James (Inglorious, Trans-Siberian Orchestra)
Tomas Andersson (Corroded)
Mikee W Goodman (SikTh, Primal Rock Rebellion)
Captian Chris Bowes (Alestorm, Gloryhammer)
Liv Sin (ex Sister-Sin)
Erik Turner (Warrant)
Arjen Anthony Lucassen
Rikard Sjoblom (Gungfly, Big Big Train, ex-Beardfish)
Don Jamieson (That Metal Show)
Joey Z (Life Of Agony)
Axel Rudi Pell
Ray Violet (Jesters of Destiny)
John Mitchell (Frost*, It Bites, Lonely Robot)
John Arch (Fates Warning, Arch/Matheos)
Brad Gillis (Night Ranger)
Jarvis Leatherby (Night Demon)
Wino (The Obsessed, Saint Vitus, Spirit Caravan)
Marios Lliopoulos (Nightrage)
Nameless (Ghost Bath)
Charlie Engen (Scale The Summit, Ideology, Drum Instructor)
Tobias Gustafsson (Cut Up, ex-Torture Division, ex-Vomitory, Amon Amarth (guest drummer)
Herman Li (Dragonforce)
Chuck Burgi (Billy Joel, Tokyo Motor Fist)
David Austin (Blood Divisions, Nasty Savage)
Ryan Hayes (Righteous Vendetta)
Jimi Bell (House Of Lords)
Kevin Sharp (Lock Up, Venomous Concept, ex Brutal Truth)
John Kevill (Warbringer)
Ryan Leitru (Nothing Left, ex For Today)
Eddie Hermida (Suicide Silence)
Ernie C (Body Count)
Dreamshade
Lanvall (Edenbridge)
Dan Briggs (Between The Buried And Me, Nova Collective)
Ernie Rodrigues (Sicosis)
Joe Taylor (Versus)
Jason Ward (Irata)
Mike Schleibaum (Darkest Hour)
Danne McKenzie (Satan Takes A Holiday)
Donald Tardy (Obituary)
Max Gorelick & Jake Miller (The Mantle)
Steve Brown (Tokyo Motor Fist, Trixter)
Kyle Haws (Vangough)
Marko Palmen (Evocation)
Logan Mader (Once Human, ex-Machine Head, Producer)
John Bush (Armored Saint, ex-Anthrax)
Bumblefoot (Art of Anarchy, solo, ex-Guns & Roses)
Niklas Sandin (Katatonia)
Teloch (Mayhem, Nidingr)
Chris Barnes (Six Feet Under, ex-Cannibal Corpse)
Nick Beggs (The Mute Gods, Steve Hackett, Steven Wilson)
Ferry Damen (Antropomorphia)
Jacques Serrano (Cultural Warfare)
Dianne van Giersbergen (Xandria)
Nikki Layne (Lucid Fly)
J.R. Martinez (Hostile)
John Garcia (ex-Kyuss, ex-Vista Chino, solo)
Tim Bowness (Solo, No-Man)
Bill Fore (Mutiny Within)
Paul Delaney (Black Anvil)
Jack Russell (Jack Russell's Great White)
Stephen Pearcy (Ratt, Solo)