Ulver - Bergtatt (the whole album is just awesome, and when you take into consideration that Garm was nineteen when it was released , its even more impressive)
Arcturus - Everything, but especially The Sham Mirrors. Easily one of the best vocal performances in metal.
Emperor - Empty (Incredible sophisticated use of shrieks)
Opeth - Everything. Mikael Åkerfeldt has imo the best growl in metal, combined with an exquisite clean voice as well.
Kalmah - Heroes to Us (A modern metal anthem in my opinion, and the chorus is very impressive, in how Pekka mixes high and low growls.)
Porcupine Tree - Anesthetize (Steven Wilson is a god when it comes to vocal harmonies)
Peste Noire - La Sanie des siècles - Panégyrique de la dégénérescence (just the most evil BM shrieks I've ever heard)