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DETROIT - JANUARY 31: Rock and roll band 'Led Zeppelin' performs onstage at the Olympia Stadium on Januaryl 31, 1975 in Detroit, Michigan. (Photo by Michael Marks/Michael Ochs Archives/Getty Images)

DETROIT - JANUARY 31:  Rock and roll band 'Led Zeppelin' performs onstage at the Olympia Stadium on Januaryl 31, 1975 in Detroit, Michigan. (Photo by Michael Marks/Michael Ochs Archives/Getty Images)

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Robert Plant of Led Zeppelin (Photo by Laurance Ratner/WireImage)

Robert Plant of Led Zeppelin (Photo by Laurance Ratner/WireImage)

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Robert Plant of Led Zeppelin during Led Zeppelin in Concert at Market Square Arena - 1-25-1975 at Market Square Arena in Indianapolis, Indiana, United States. (Photo by Laurance Ratner/WireImage)

Robert Plant of Led Zeppelin during Led Zeppelin in Concert at Market Square Arena - 1-25-1975 at Market Square Arena in Indianapolis, Indiana, United States. (Photo by Laurance Ratner/WireImage)

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Robert Plant of Led Zeppelin (Photo by Laurance Ratner/WireImage)

Robert Plant of Led Zeppelin (Photo by Laurance Ratner/WireImage)

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Robert Plant of Led Zeppelin (Photo by Laurance Ratner/WireImage)

Robert Plant of Led Zeppelin (Photo by Laurance Ratner/WireImage)