Klausner parsed details of harmonics and rhythm in his April 8 ruling concluding the dispute couldn't be settled without a trial.
"While it is true that a descending chromatic four-chord progression is a common convention that abounds in the music industry, the similarities here transcend this core structure," Klausner said. "For example, the descending bass line in both Taurus and Stairway to Heaven appears at the beginning of both songs, arguably the most recognizable and important segments."
Stairway to Heaven is one of the most successful rock songs of all time, having earned hundreds of millions of dollars. Since Led Zeppelin's first album in 1969, the band was known to have drawn inspiration from other musicians, some of whom brought legal challenges many years later. As a result, the band has been forced to alter the credits and redirect portions of royalties for some of its biggest songs, including Whole Lotta Love and Babe I'm Gonna Leave You.
The statute of limitations for civil copyright infringement under U.S. law is three years, but courts often interpret that limit as only restricting back royalties to the previous three years, not barring old infringement claims.
To show infringement under U.S. copyright law, a claimant generally needs to demonstrate that an original work was copied to make a new work that was substantially similar, and that the copier had access to the original work.
California didn't complain publicly about Stairway to Heaven until a 1997 magazine interview. He drowned that same year while rescuing his 12-year-old son from a rip current in Hawaii.
- Bloomberg