Led Zeppelin will be re-climbing the stairway to a federal courthouse after a federal appeals court on Friday ordered a new trial in a case accusing the legendary rock band of ripping off one of rock’s most recognized riffs.

A federal court jury in June 2016 found Led Zep did not steal the opening riffs of “Stairway to Heaven” from the song “Taurus” by the band, Spirit.

But the 9th Circuit Court of Appeals in San Francisco ordered the retrial because the jury should have been allowed to hear a recording of “Taurus” — an obscure instrumental on the first album of the California band.

A trustee for the estate of Randy Wolfe, the writer of “Taurus,” claimed in the suit that Led Zep copied the song’s descending chromatic scale for the opening of rock anthem “Stairway to Heaven.”

The jury did not get to hear “Taurus” played in the courtroom because its composition had copyright protection. Instead, jurors were forced to issue a ruling based only on the testimony of music experts and renditions of “Taurus” as dictated by its sheet music.

“We conclude that the district court abused its discretion by not allowing the sound recordings of ‘Taurus’ to be played,” the three-judge appeals panel wrote in its 42-page decision. “Further, at any retrial, the district court should reconsider whether an inverse ratio jury instruction is warranted.”

The inverse ratio rule could prove critical at retrial as it lowers the bar for showing similarity between two works to the degree a defendant had access to the work a plaintiff claims was copied.

The trustee for “Taurus” composer Wolfe maintains that Spirit performed the song while touring with Led Zeppelin in 1968 and 1969.

“Stairway to Heaven” was released in 1971 on an untitled album known as “Led Zeppelin IV,” with band members Jimmy Page and Robert Plant receiving writing credits.

In its earlier defense of the creation, Led Zeppelin called the opening chord progression of “Stairway” a musical convention not worthy of copyright protection.