booboo in your list you forgot Motorhead..
haha
anyways i agree Big3 genres are stupid, but they are there and that won't change.. half of the fights here are about what band belongs to what genres.. hense this one right now.
my father an teenager in the 70's along with all of his friends, and everyone he went to school with. most of them listened to Metal, and what they called matel bands were Zeppelin, Sabbath, and NOT QUEEN? anyways bands like boo boo has said (all but queen) were considered to my father and his friends to be metal bands.. and no there opinions doesn't make it true.. but then again neither do any of yours.. we place them where we see fit.. until someone says its fact and word gets spread.