Raw stuff from Golgolot. Thx muman
the "deep voice" as you described is called screams. No grunts or growls. It's done to show atmosphere in the music which is what Black Metal consist of in the first place. It is cold sounding, grim, forests, mountains.
Type "Freezing moon" on youtube and you will understand.
It is not beauty. It's not a sunflower or a rose. It's a dark theme atmospheric art.