a couple of my favorite without being redundant
King Diamond
Nils K. Rue (pagan's Mind, Eidolon)
Messiah Marcolin (Candlemass, Menento Mori)
Thomas Lundin (Hexenhaus)
Harry Conklin (JP)
Kristian "Krille" Andre'n (Tad Morose, Fifth Reason, Memento Mori)
Mikael Alkerfeldt (Opeth)