A copyright case brought against Led Zeppelin will return for an encore after a Ninth Circuit appellate panel called for a retrial, ruling that the district court “prejudicially erred” in its instruction to the jury.

According to the lawsuit, Led Zeppelin’s 1971 anthem “Stairway to Heaven” was a little too similar to “Taurus,” a 1967 instrumental by American rock band Spirit. Lawyer Michael Skidmore filed the suit on behalf of Spirit’s front man Randy Craig Wolfe, also known as Randy California, who died in 1997.