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But one concert stood head and shoulders above the rest, sonically: Led Zeppelin at Earl’s Court on May 25, the finale of a five-concert run, during which Zeppelin played a three-hour, 20-song set, including a three-song acoustic segment. Comparing Wings (a group unashamed to put out a nursery rhyme as a single) to Led Zeppelin was like comparing a comfy pullover with a studded leather suit, but just as the Bowie concert in Nashville had turned Paul on to the appeal of a live horn section, watching one of Britain’s premier rock groups up close was eye-opening. “The basis for our [1975–76] show was a Led Zeppelin concert we saw in London,”54 Paul happily acknowledged.
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Allan Kozinn (The McCartney Legacy: Volume 2: 1974 – 80: A comprehensive look at Paul McCartney's life and work post-Beatles.)