I'm not a fan of Norma Jean (I like say one song from them, or something) but I'm a big death metal fan myself, but only for the bands that truly put experimentation, talent, songwriting exploration, and timelessness into the mix.
For example, one of my favorite bands of all time, Opeth:
Opeth - Porcelain HeartUsually, the vocalist/guitarist uses a growling vocal technique (a bit alike to how Chinese Monk's train their voice to do a hollow chant) for parts of many of his songs, but these two particular songs only features his blues-acoustic voice. Great band, IMO. Very pretty stuff.