My favorites:
Blasphemy, Fallen Angel of Doom and Blood Upon the Altar
Samael, both Worship Him and Blood Ritual.
Beherit, Drawing Down the Moon
Mercyful Fate, Melissa and Don't Break the Oath
Mayhem, the true only, stay away from the reformed bs.
Root, Zjeveni and Hell Symphony
Incubus, God Died On His Knees
Morbid Angel, Abominations of Desolation
Sepultura, Morbid Visions and Schizophrenia
Sarcofago, INRI and Rotting
Pagan Altar, Volume 1
Pentagram, early daze stuff, relentless, day of reckoning
Candlemass, Epicus Doomicus Metallicus
Rotting Christ, Thy Mighty Contract
Hellhammer and Celtic Frost, To Mega Therion and before
Sodom, Obsessed by Cruelty (make sure to get the LP version, two mixes to this)
Von, Satanic Blood
Necros Christos, everything, full length is so good
Archgoat, everything
Death SS, get the comp with the Evil Metal ep and earlier stuff
Black Hole, Land of Mystery (good luck finding this)
Negative Plane, Et In Saecula Saeculorum
Mortuary Drape, everything before buried in time.
Satyricon, I actually like everything but Volcano by them. Newest album is great.
Grave, Into the Grave
Bethlehem, first 3 releases
Immortal, Diabolical Fullmoon Mysticism
Master's Hammer, Ritual and The Mass demo
Bathory, Blood Fire Death and before
Venom, Welcome to Hell and Black Metal
Necromantia, Crossing the Fiery Path and the Varathron split
Order From Chaos, everything
Ved Buens Ende, everything (everyone should check them out)
Burzum, don't have to explain, pretty big now.
Tormentor, Seventh Day of Doom and Anno Domini
Autopsy, Mental Funeral
Darkthrone, Panzerfaust and below. Listen to goatlord until you get it
![Smile :)](./images/smilies/icon_smile.gif)
I have hundreds of bands I could list. PM me if you want a ton of other quality stuff I left out.