True McFly, Zep is extremely influential in rock ... however, without one primary band from the 70's most bands mentioned here would still be playing in their garages wondering how they could make the big money money and get the chicks. And to this day I cannot believe after all these similar threads no one has really paid hommage to them.
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That band? Black Sabbath
No matter what your hatred is for Ozzy or how much Tony Iomni is an all-around control freak, or how much we wondered why Geezer would be called Geezer, or how we still wonder how the amazingly simple but pounding rhythms of Bill Ward influence drummers today ... without THAT foundation they had (and hence bringing to pass the title "acid rock")
NO metal band of today or yesterday would have amounted to anything more than an itch in a producers pants.