The musical score of "The Empire Strikes Back" was composed and conducted by John Williams, and it was performed by the London Symphony Orchestra at a cost of about $250,000. In 1980, the company RSO Records published this film's original musical score as both a double LP album and as an 8-track cartridge in the United States. Its front cover artwork features the mask of Darth Vader against a backdrop of outer space, as seen on the advance theatrical poster for the film.