male:
1. Messiah Marcolin (ex-Candlemass)
2. Jan Kenneth Transeth (ex-In The Woods...)
3. Alan 'Nemtheanga' Averill (Primordial)
4. Big Boss (Root)
5. Mike Akerfeldt (Opeth)
+ Matthias Blad (Falconer), Kobi Farhi (Orphaned Land), Jonas Renkse, Warrel Dane (Nevermore), R. J. Dio, Robert Lowe (Solitude Aeturnus, Candlemass), Nils Patrik Johansson (Wuthering Heights, Astral Doors, Lion's Share, ex-Space Odyssey)
female:
1. Agnete Kierkevaag (Madder Mortem)
2. Gunnhild Sundli (Gåte)
3. Vibeke Stene (ex-Tristania)
4. Johanna de Pierre (ex-Amaran)
4. Anneke van Giersbergen (ex-The Gathering)
+ Emma Hellström (The Provenance), Diana Serra (Aghora), Synne Soprana (ex-In The Woods...), Mariana Holmberg (Left Hand Solution)