Grindcore

Grindcore is a fusion of crust punk, hardcore punk and thrash metal or death metal. It is characterized by growling vocals, blast beats, and incredibly short songs with lyrics that are often focused on gore and violence, though sometimes the lyrics can be political. Grindcore, in contrast to death metal, is often very chaotic, and lacks the standard use of time signatures. The style was pioneered by the British band Napalm Death in the eighties. Other notable grindcore bands include Carcass, Brutal Truth, Anal Cunt and Pig Destroyer. Grindcore is characterized by a noise-filled sound that uses heavily distorted, down-tuned guitars, grinding overdriven bass, high speed tempo, blast beats, and vocals which consist of incomprehensible growls, or high-pitched shrieks.

Associated Sub-Genres: Deathgrind, Goregrind

Source: http://en.wikipedia.org/wiki/Grindcore