Alot of people find his voice annoying but it was the first thing that cam to my head when you said dark music

Type O negative - Black No1 (Little miss scare all)

Also a band called
"Acid Bath" are amazing...they only did two albums but if you have access to d/l them I strongly reccomend it...

He also was in a band called "Deadboy and the lephant men" Which was alot slower and more depressing if thats what you are looking for....

I just love his voice

Ill upload and post a link if you cant find that Type o Negative song....if your interested