Don't you mean melodeath? And Carcass helped form brutal death metal, I think.I have no idea what that even sounds like. Ill look it up in a bit. If its anything like i think, it reminds me of Eluveitie. Thats definitly some interesting stuff if you like irish folk stuff and metal at the same time.
Ive been listening to a lot of carcass lately. They're album heartwork that helped create melodic metal has got to be one of the greatist things ever writen. I love melodic.
EDIT: My bad. They formed melodeath.