To further embarrass myself... I'm not trying to defend "horror rap", everything I've heard is total shite, but... there's a guy named Kool Keith who put out a cd back in the 90's called Dr. Octagonecologyst. I wouldn't go so far as to say it was horror rap, but it was extremely off kilter, sort of sadistic and had esoteric references to serial killers. I'd post a link, but I know no one would bother clicking lol
Listening to the song that made me bug my parents into buying a guitar for me when I was 13. That was 23 years ago and I still can't play like this.