Simon O'Laoghaire in Primordial
Avi Daimond in Orphaned Land
Daniel Liljekvist in Katatonia (esp. TGCD and VE)
Sean Reinert in Cynic, Gordian Knot and esp. Aghora
Gian Rubio in Aghora
Van Williams in Nevermore
Lopez in Opeth
Anders Kobro in In The Woods... and Green Carnation