I think now I understand your point. True, if there was a New Wave, therefore an Old Wave should have been before. And yes, was it legit to consider the 70's bands a metal wave? But then again in the name of historical revisionism were Black Sabbath, Judas Priest, Deep Purple, Rainbow, Thin Lizzy, Motorhead, AC/DC, Led Zeppelin, Blue Oyster Cult, Rush (OK the last two are not UK bands but anyway) metal bands in the 70's or hard rock? Is (was) there a difference between hard rock and heavy metal? When heavy metal was actually started to get used as a moniker for that type of music?