Weal i will explain to it you since there is a huge diffrence in black metal and death metal. Almost like comparing Jazz with Blues. THe main Black metal bands are Emperor, Mayhem, Bathory, Abigor, and there are many sub genres in black metal like old school black metal, epic black metal, raw black metal. Each style of black metal is very diffrent from the other. For example old school black metal i would say Bathory and Venom fit in here perfectly, they have a very thrash influanced sound but carry the ocult and satanic (some nationalist, Bathory) topics most black metal bands are based around today. Epic black metal is Summoning, Burzum, Bal Sagath est.. this is more atmophric but still stay with in the genre. And there are more raw bands like Mayhem, Abigor, old Emperor, Zyklon - B est.. very fast music with alot of growls and very techniqule drums and guitar. Black metal is mostly based In Norway and in the past the U.K. death metal started in Flordia and Sweden and there is alot of sub genres of death metal like Brutal Death Metal nile, Inncontation, Pesmist, Canibal Corpse, est.. this is very fast and tecnhniqule but sounds very diffrent from black metal. There is doom metal witch is slower death metal but still with the technique and very romace based bands include my dying bride, novembers doom est. and melodic death metal, i dont realy care for this style but it is very comerical sounding and easy to listin to bands like In Flames, Dark Tranquility, and Arch Enemy. Hope this helped