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There are a few critical differences (...) While LZ may have laid the groundwork for metal, BS is the first metal band.




I´d just add that, while Jimmy Page was a skilled studio musician who played on almost every album of every genre made in England during the 60´s, Tony Iommi had to develop his own style because he´d lost part of his fingers.

And John Bonham was a highly technical drummer, while Bill Ward, in his own words, "just kinda followed whatever Terry and Tony were doing". And, IMO, it worked fine for the Sabbath sound.