"FILE--In this March 5, 1998, file photo, Led Zeppelin's Robert Plant, left, performs with guitarist Jimmy Page during their concert in Istanbul. A U.S. appeals court on Friday, Sept. 28, 2018, ordered a new trial in a lawsuit accusing Led Zeppelin of copying an obscure 1960s instrumental for the intro to its classic 1971 rock anthem ""Stairway to Heaven.""  (AP Photo/Murad Sezer, File)"
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