Grindcore

Grindcore only has one band; Job for a Cowboy. And fuck, they rock. The genre is characterized by pig squeals, pinch harmonics, and simplistic breakdowns.

Grindbore
All JfaC imitators (Napalm Death, Terrorizer, Carcass, etc.) are fucking awful and not true grindcore. Napalm Death's album Scum is widely considered a failure and probably one of the worst albums to ever be recorded (besides Altars of Madness, see article).

Black Label Society
Another decent grindcore band is BLS, which stands for Blacks Leave Society, which is a social message directed to all of those whose skin is colored. Seriously, why are you still in my country? Get the fuck out darkie.