MhhhmmmPrimordial. Why? Because they write great, epic songs and "Dark Song" fucking rules!
Mournful Congregation
Nobody. Acoustics in metal are nice things to supplement the music, but being solely acoustic contradicts what metal is all about.
Who said it has to be "metal"?
Because I'm not a fan of acoustic rock.
Agalloch.....maybe.
I was going to say Agalloch, then I realised that at least half of their stuff is acoustic anyways.