Quintessence by Borknagar is required material for anyone interested the heterosexual lifestyle. Album flat out RULES.
I wouldn't say he's the greatest ever, but he's one of them. His range is amazing and his voice is completely unique and insanely epic. That's the most important part. Whenever he sings it's like he's leading the entire Norwegian army running full speed into battle with swords blazing ready to conquer all.
He single-handedly made Dimmu Borgir interesting for me. Every album he's performed on has been perfect. Basically, Vortex is the fucking man and I'm putting on Quintessence right now.
Appreciated.