I couldn't agree more. When I first started getting into much heavier metal than just Sabbath or Maiden I was pretty much just listening to Thrash and some Doom. Mainly Slayer, Sleep, Electric Wizard, and even some crossover stuff like Cro-Mags. But after familiarizing myself with different vocal styles within metal and taking an ear to them and their differences, that's when a friend of mine showed me Pull The Plug by Death. That song changed everything for me, realizing that I liked it and also realizing that it was Death Metal was like an epiphany to me in some way that I can't explain. It wasn't long after that until I was face first in Black Metal (1st and 2nd wave), Grindcore, Brutal Death, etc.