As it turned out, Led Zeppelin's infamous 1969 debut album was indicative of the decade to come--one that, fittingly, this band helped define with its decadently exaggerated, bowdlerized blues-rock. In shrieker Robert Plant, ex-Yardbird Jimmy Page found a vocalist who could match his guitar pyrotechnics, and the band pounded out its music with swaggering ferocity and Richter-scale-worthy volume. Pumping up blues classics such as Otis Rush's "I Can't Quit You Baby" and Howlin' Wolf's "How Many More Times" into near-cartoon parodies, the band also hinted at things to come with the manic "Communication Breakdown" and the lumbering set stopper "Dazed and Confused". --Billy Altman