Carcass were one of the forefathers of grind. The operative word here is were... Bill Steer, having laid it down with Napalm Death, moved on to form Carcass. Swansong is one of the weakest downfalls of a band ever laid on to tape... Their first three cds are their best, Heartwork, their fourth, definitely overrated. It may have influenced a lot of bands, but within their own catalog, I think it is definitely the beginning of the spiral downward.