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Plot: This two-part video biography celebrates the music of Led Zeppelin, a British rock act formed in the 1960s that went on to influence legions of future stars with a blues-influenced sound, groundbreaking guitar riffs and inventive drum rhythms. Noted personalities in the music industry weigh in on the group's contributions to the canon of rock 'n' roll, a discussion illustrated by clips from the band's rich archive of live performances