death metal

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A style of heavy metal music characterized by harsh, violent, often nihilistic lyrics that are usually growled or shouted.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun music A subgenre of heavy metal typically employing moderate to fast tempos, heavily distorted guitars, deep growling vocals, blast beat drumming and complex song structures with multiple tempo changes, often having violent or dark lyrics.