Tell you what RO - I am glad this guy didn't rock up and say he'd just discovered Uzbekistanian Folk Music or I'd have been screwed list wise!
Darkthrone "A Blaze..." is an amazing intro to BM - good call tmik!
Pantera's "Vulgar..." is one of the best records of the 90s, I'd dispute the tag of "groove metal" because for me Pantera were just a straight up fucking heavy metal band who did it with their own sound, when everyone else seemed to be toning down and going all melancholic they just raised a middle figure to the music world and went at it like a herd of bulls in a china shop! Great album to recommend though, I'd add "Far Beyond Driven" in there too as they somehow managed to take things on a step further with that record.
Check out Bandcamp for new bands/music too guys. (Money goes direct to artist/label)