Oh Wikipedia, won't you please save me from my cultural ignorance?
From Black Metal
During the 1980s, several thrash metal and death metal bands formed a prototype for black metal.1 This so-called "first wave" included bands such as Venom, Bathory, Hellhammer and Celtic Frost. A "second wave" arose in the early 1990s, spearheaded by Norwegian bands such as Mayhem, Burzum, Darkthrone, Immortal and Emperor. The early Norwegian black metal scene developed the style of their forebears into a distinct genre. Norwegian-inspired black metal scenes emerged throughout Europe and North America, although some other scenes developed their own styles with no connection to the Norwegian one.
From Death Metal
Building from the musical structure of thrash metal and early black metal, death metal emerged during the mid-1980s.2 Metal bands such as Slayer, Kreator, Celtic Frost, and Venom were very important influences to the crafting of the genre.2 Possessed and Death, along with bands such as Obituary, Carcass, Deicide, Cannibal Corpse and Morbid Angel are often considered pioneers of the genre. In the late 1980s and early 1990s, death metal gained more media attention as popular genre niche record labels like Combat, Earache and Roadrunner began to sign death metal bands at a rapid rate. Since then, death metal has diversified, spawning a variety of subgenres.
That's the problem with metal bands these days. No one wants to be the chicken. No one wants to be the egg.