Despite Ozzy Osbourne helping pioneer heavy metal, some vocalists in the genre were enough to leave him completely speechless.
Led Zeppelin's groundbreaking album not only delivered their first U.S. Billboard No. 1 but also forever changed the face of rock music.
This Led Zeppelin song didn't fit the band's reputation, but it also wasn't one they'd ever planned to be their official farewell to the singles charts.
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