A British band who, in the 80s and then the 90s, helped to start and then define grindcore music. They are still generally regarded as the genres primogenitors. Grind is basically short and fast, with very sludgy guitars and bass and shouty/
growly vocals. Short in the extreme sense -
Napalm Death's best known record,
1987's Scum, contained 28 tracks in 33 minutes, the longest being just over 2 minutes, and the shortest being 4 seconds. Because of these aspects, grind has obviously never really gotten through to the mainstream. Napalm Death are still going today (Feb 2004).