Bands like Led Zeppelin, Uriah Heep and Deep Purple aren't what I consider heavy metal bands at any time in their careers. They are hard rock bands like Van Halen and Ted Nugent. The first heavy metal band plainly had to be Black Sabbath, who may of had influences from earlier rock and blues bands, but Sabbath's music was original in it's own way with their dark and evil sounding rhythms and lead the way to heavy metal bands like Judas Priest and Iron Maiden, later evolving into speed and thrash metal bands like Metallica and Megadeth during the 80s and 90s. You also had the metal hair-bands like Poison and Warrant, but to me, those bands were more glamour rock than metal
I don't know if any new band today can be labeled as "heavy metal". Today you have bands like Godsmack, Staind, Rob Zombie, Tool and Disturbed which are a combo of metal, hard rock and grunge.
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