EDIT: I was typing this as Daniel was putting his on top. Just think of mine as "expanded," plus stuff he already put
Darkthrone - Blaze in the Northern Sky, Under a Funeral Moon, or Transilvanian Hunger(Classics)
Burzum - Det Som Engang Var, Hvis Lyset Tar Oss(Melancholic)
Emperor - Emperor/Wrath of the Tyrant, In the Nightshade Eclipse, Anthems to the Welkin at Dusk(Each is progressivly more symphonic, but they're all good releases)
Immortal - Pure Holocaust(Also classic)
Nargaroth - Black Metal ist Krieg(A little bit of everything)
Satanic Warmaster - Stregnth and Honour(Empowering black metal)
Isengard(Nor) - Hostmorke(One form of folk black metal)
Ulver - Bergtatt(Another form of folk black metal)
Weakling - Dead as Dreams(Powerful black metal)
Aura Noir - Black Thrash Attack(as the title states...)
Anaal Nathrakh - The Codex Necro, When Fire Rains Down From the Sky Mankind Will Reap What it has Sown(Psudo-industrial black metal. Also fucking
heavy)
Mystic Forest - Romances(Beautiful)
Vlad Tepes - Celtic Poetry(Epic black metal without falling into the trappings of usual "epic" music)
Vlad Tepes/Belkertre - March to the Black Holocaust(Best thing to come from the LLN)
Graveland - Thousand Swords(Epic, beautiful, and powerful)
Destroyer 666 - Cold Steel for an Iron Age(Black/thrash)
Witchery - Restless and Dead(Black/Thrash)
Carpathian Forest - Black Shinning Leather(Black n' Roll)
Leviathan - Tenticles of Whorror(Semi-prog black metal)
Xasthur - Gate Through Bloodstained Mirrors(Depressing)
Krieg - Destruction Ritual(Noise/Black)
Velvet Cacoon - Genevieve(Ambiant/Black)
Taake - Over Bjoergevin Himmerik Graater(Melodic Black Metal at it's best)
Deathspell Omega - Si Momentum Requires Circumspice, Kenose(Technical black metal, but maybe "religious" is a better term as Emokid says)
Bathory - Bathory, The Return, Under the Sign of the Black Mark, Blood Fire Death(Proto-black)
Hellhammer - Apocalyptic Raids(Proto-black)
Celtic Frost - Morbid Tales, To Mega Therion(Decidedly less "black" than Hellhammer, but keeps most of the ideas)
Mayhem - Deathcrush(The first album, I believe, to have the modern black metal sound)
I think I covered all the bases there...