Composed by John Williams for The Empire Strikes Back in 1980, the Imperial March became Darth Vader's defining musical identity and one of the most recognisable themes in film history. Its strict marching rhythm and dark brass writing were designed to suggest the military might of the Galactic Empire. The theme returned throughout the Star Wars saga and entered everyday culture through parodies, sports entrances, commercials and online videos, where it now signals authority, villainy or an over-the-top entrance even for people who have never seen the films.