The Imperial Fugue

John Williams composed "The Imperial March" from Star Wars as a military march because that's how Dart Vader enters a scene. It's a tune that's been stuck in your head for almost 50 years now. Or at least in mine. 

Swedish guitarist Lucas Brar turned "The Imperial March" into a fugue, which is a composition with a main theme plus bells and whistles that complement and compete with the main theme but always comes back to it. Read a better explanation here. Johann Sebastian Bach was well known for his musical fugues. Brar was thinking of Back when he dressed up the march in a way that make it sound a little less ominous, or at least least a little less military, and a lot more interesting.