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I forget if I've said this before but you gotta listen to atheist. the first album is great but the 2nd is like... top 15 all time, 10 on a good day maybe. fucking monstrous stuff. if you've heard then rifle through bathory's first 5-6
other bm stuff you'll prob dig:
master's hammer - ritual
root - first 2
eldrig - everlasting war divinity
windir - 1184 and the one before that
dissection - first 2
and dm:
carcass - necroticism (goat)
literally anything by bolt thrower
immolation - close to a world below
most stuff by suffocation
dismember - like an everflowing stream
more shit I'll remember later
oh and listen to bestial invasion by destruction (it's a song, infernal overkill is album). dat riff. Varg approved