Aw too bad Helter Skelter can't get in. And I'm actually going to challenge myself a little bit, I know most albums are going to come from the 70s-80s and with good reason but newer-ish albums that were influential for the new wave of metal I think would be interesting too to consider
Slipknot - Iowa
Metallica - Master of Puppets
Black Sabbath - Paranoid
Linkin Park - Hybrid Theory
You were the cancer, that's all you'll ever be
I really messed up this contest, but
azuarc
gave it a Breath of fresh air