Vintersorg - love his band, and he's great on Borknagar's new album, Empiricism. Definitately one of the best.
Garm - the greatest BM vocalist of all time, love his work in Ulver, Arcturus, Borknagar, and that one song by Zyklon (the name escapes me!). Very choir-like clean vocals.
Simen Hestnaes (I.C.S. Vortex) - great stuff from Borknagar, and also Dimmu Borgir, very passionate clean vocals.
Ihsahn - the Wagner of black metal! My personal favorite vocalist. In each album he has his own distinct sound, and I love his ardent clean vocals from the later albums, especially on Prometheus. I love the clean vocals part on The Tongue of Fire! "The soul... is never silent..."
Agathon - not sure about his other bands, but I really like his vocals in Gloomy Grim. Gloomy Grim is hilarious!
Nocturno Culto - his vocals for Darkthrone are pretty cool.
Maniac - I like him from when Mayhem was good, and I recommend Wolf's Lair Abyss. Did you know he was the singer before Dead? Not too sure on the details, but he probably left or was arrested, and then rejoined later.
Daemon - I really like him. Limbonic Art is an amazing band, and is severly underrated. I've talked to some people who didn't take a listen to them because they thought they were hardcore or grind, or whatnot! And also, Daemon is good in Zyklon.
Im not too familiar with many death metal vocalists. I like Johan Hegg from Amon Amarth, and then I have already mentioned Zyklon. I would somewhat conisder them death metal.
