Anarchus - Final Fall of the Gods
If I had to listen to just one grindcore band these mexicans would be my choice. Fucking hateful grind guaranteed to make your ears bleed. They were one of the great sensations of the underground in early 90's. Each and every one of their recordings is recommended.
Septicemia - Sabbath Conventions
Merciless - The Awakening
The first release of Euronymous' Deathlike Silence this is deathrash of the highest quality. Whoever doesn't know of this record is on the wrong page. Monumental.
Pentagram - Fatal Prediction / Demoniac Possession
The latin americans have a unique way to play thrash/black metal. Darkness, violence, Satan and death.
Fuck you and goodnight.