Death/doom is the shit. Check out Dusk, Disembowelment, Mythic, Winter, Infester [US] and Coffins [Japan]. Rottevore isn't "doom metal" but they are a great example of a crushing doomier DM band. Really early Carpathian Forest (the Bloodlust And Perversion demo) is some suprisingly great death/doom metal also.

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