Jones also played 3 recorders on ‘Stairway to Heaven’ Robert Plant, Jimmy Page, and John Paul Jones perform as Led Zeppelin at the Greensboro Coliseum on January 29, 1975. | Rocky Widner/FilmMagic ...

Led Zeppelin’s opening act in its trial defense over claims its rock classic “Stairway to Heaven” ripped off an earlier song was a musicologist tapping out the tunes on an electronic piano.

The civil trial against Led Zeppelin singer Robert Plant and guitarist Jimmy Page begins Tuesday as the pair face accusations that the opening chords from the band’s iconic “Stairway to Heaven ...