FILE - In this July 13, 1985 file photo, Led Zeppelin bandmates, singer Robert Plant, left, and guitarist Jimmy Page, reunite to perform for the Live Aid famine relief concert at JFK Stadium in Philadelphia. 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/Amy Sancetta, File)