I don't know how you guys can say that GNR isn't metal. I know what you mean about putting them in the same category as AC/DC, because it's not quite as heavy as some of the other ones listed. I'd definitely put my favorite band from the 80s in there, too... Motley Crue. Anyway, since this is about heavy metal, I'll say that you must include Ministry (Psalm 69 and The Mind is a Terrible Thing to Taste). They absolutely kick ass!