Death metal

The only legitimate form of music left. And if anyone says otherwise, you must decaptitate them, hollow out their eye sockets, and plant their heads on a pike, to prove your true kvltness and dedication to the Extreme Metal Underground.

Early History
Everyone from the early history is awesome. Except Cannibal Corpse - they're fucking weird.

Later History/Sub-Genres
Unfortunately, while a fair number of death metal bands got even more awesome and dubbed themselves Brutal Death Metal (hail Suffocation), a fair number of bands learned the wrong lesson from the early brutal bands and associated endless chugging with brutality, which is what is known as slam death metal, or, if you recognize the wiggerdom of these people, wigger slam.

There were also a bunch of bands who got the wrong idea from Obituary, and cross-bred them with Iron Maiden, which is how you got Melodic Death Metal. Melodeath itself is not as cool as Brutal DM, and later got corpse-humped by Hatebreed, which unfortunately led to mallcore bands like Avenged Sevenfold and Killswitch Engage.

But in good news, a lot of bands got the right idea from Death when they went all jazz-fusion-y, which worked way better than it should have. This led to Technical Death Metal, which frequently cross breeds with Brutal DM to produce something so awesome, only the absolute most true kvlt of death metalheads can avoid exploding head syndrome.

Someone even got the idea to combine Death and Black metal, but only after Black stopped being kvlt. Because of this, bands calling themselves Blackened Death Metal are often suspect. And don't even get started on those Death Doom posers.