In 2004, the Sony Classical Records company purchased the sales rights of the original trilogy's musical scores—primarily because it already had the sales rights of the music from the trilogy of prequels: "The Phantom Menace", "Attack of the Clones", and "Revenge of the Sith". Hence in 2004, the Sony Classical company began manufacturing copies of the film-score CDs that RCA Victor had been making since 1997, including the one for "The Empire Strikes Back". This set was made with new cover artwork similar to that of the film's first publication on DVD. Despite the digital re-mastering by Sony Classical, their CD version made and sold since 2004 is essentially the same as the version by RCA Victor.