Doom 1 and 2 guitar riffs from Metallica, STP, Alice In Chains, Pantera, etc.

Bunch of good youtube vids with details  

 Metallica, no remorse

Pantera, rise

Pantra, mouth of war

Pantera , regular ppl deceit 

Metallica, master puppets

Ac dc, big gun

Slayer  ehins the crooked cross

Pantera, mouth for war

Slauer, south of heaven

Pantera, this love

S.o.d,

Megadeth hanger 18

Atheist, samba briza

Stp, sex type thing

Black sabbath, after all the dead

Pantera, this love (pantera siad The Melvins changed it for them, new sound, then they all did their thing)

Alice in chains, them bones

Alice in chains, angry chair

Crazy Doom2 sculpture from 2014.