There are a lot of death metal bands. Starting back in the early eighties.
Death Metal has roots in Sweden. The excitement for Death Metal spread and by the late 1980's, many bands were created. Some of the most notable bands include Slayer, Kreator, Celtic Frost, and Venom.
Almost none. It depends. Just google it. But if you hear it on mainstream American radio, it's not death metal.
No real statistics on this, not to mention numbers would be skewed based on what the perceptions of Death Metal are by various people... for example, a lot of the purists (myself included) tend to exclude these Gothenburg/"Melodeath" bands, which tend to be derived more from Speed and Power Metal, and don't have much - if any - commonality with Death Metal bands. For a rough estimate you can go over to Metal Archives and search by genre.
Tokio Hotel
Zyklon is Blackened Death Metal, and is Atheist
there are lots of heavy metal bands in America
Slipknot Slipknot are not 'death metal' they are nu metal. You want a 'death metal' band look into ABACABB, Nile or Job for a Cowboy. Also try The Black Dahlia Murder they are Melodic death metal.
Try Wicked Wisdom
The lines can be a bit vague at time. Death Metal was derived from Thrash - it basically took Thrash, and stripped it down even further to its most basic elements. Early Death Metal bands (Possessed, Incubus - the band now known as Opprobrium, pre-Arise era Sepultura, Graf Spee, etc.) were still Thrash bands at their core. In the 1990s, Death Metal sought to further the gap between Thrash bands and themselves, and turned to Hardcore Punk and its derivatives (Powerviolence, Crust Punk, Grindcore, etc.) for influence - this is especially apparent with bands such as Cannibal Corpse, later Morbid Angel albums, Deicide, etc. Thus, your more modern Death Metal bands tend to be quite distinguishable from Thrash bands, whereas earlier Death Metal bands drew a much finer line.
Angel of Disease Bohema Manticore
brutal death metal haha Try Djent Bands.
There are many great death metal bands out there, it depends on the type you like. Not all death metal is the same. Some people like Morbid Angel, but I prefer Cannibal Corpse. I would recommend Cannibal Corpse, listen to "Evisceration Plague" or "Priests of Sodom" (songs). A good place to find what death metal bands you like would be to listen to Death FM, an online radio station. The listeners chose what is played. "Death" is an excellent band Deicide is good too