FILE - In this July 13, 1985 file photo, singer Robert Plant, left, and guitarist Jimmy Page of the British rock band Led Zeppelin perform at the Live Aid concert at Philadelphia's J.F.K. Stadium. Generations of aspiring guitarists have tried to copy the riff from Led Zeppelin's ‚ÄúStairway to Heaven.‚Äù Starting Tuesday, June 14, 2016, a Los Angeles court will try to decide whether the members of Led Zeppelin themselves ripped off that riff. Page and Plant are named as defendants in the lawsuit brought by the trustee of late guitarist Randy Wolfe from the band Spirit. (AP Photo/Rusty Kennedy, File)