A request: "Proto-underground" recommendations?

[Moringotto]

According to a recent post, the bands Bathory, Celtic Frost, Sepultura and Sarcofago are considered proto-underground.  This was defined by one poster as "more than speed metal but not quite death/black metal".

What are some worthwhile band or albums to check out for listeners whose favorite bands include all of the (in some cases only early work) aforementioned artists?

[Imposition]

Sodom - Persecution Mania
Kreator - Pleasure to Kill
Slayer - Hell Awaits, Reign in Blood
Hellhammer

And perhaps, on boarder of thrash and death:

Discharge
Repulsion
Amebix
Napalm death - From Enslavement to Obliteration

[aquarius]

To my ears, even Morbid Angel and Possessed are closer to being "proto-underground" than, say, the first Incantation album. That is the start of death metal. Though there generally seems to be a lot less rigid classification of genres in the early days, which allowed for a wider array of influences. Not becoming too narrow-sighted (not necessarily a bad thing) or inversely adopting any and all influences just for the hell of it.

[Imposition]

Add:

Destroyer 666 - Violence is the prince of this world http://www.youtube.com/watch?v=wXt9MT1I1mg
Blasphemy - Fallen Angel of Doom.... http://www.youtube.com/watch?v=ZA8q8jga5xo
Blood - O Agios Pethane http://www.youtube.com/watch?v=NncldH6ZY7Y
Bestial Warlust - Vengeance War 'Till Death http://www.youtube.com/watch?v=UiV6_IaGd0U
Spear Of Longinus - Nazi Occult Metal http://www.youtube.com/watch?v=INf4lBHN6bY

Some of these are post 1990, but are pretty much proto stylistically, and good.

[Moringotto]

Discharge, Amebix, Blood, and Spears of Longinus were new to me. As of yet I listened to the first two, and Discharge in particular is hitting the spot.


Recommendations appreciated, all will be given a chance in time.

[Moringotto]

To my ears, even Morbid Angel and Possessed are closer to being "proto-underground" than, say, the first Incantation album. That is the start of death metal. Though there generally seems to be a lot less rigid classification of genres in the early days, which allowed for a wider array of influences. Not becoming too narrow-sighted (not necessarily a bad thing) or inversely adopting any and all influences just for the hell of it.

I can't disagree. Furthermore Seven Churches and Blessed are the Sick are in my top 10 metal albums of all time.