"The Imperial March", is a musical theme present in the Star Wars franchise. It was composed by John Williams for the film Star Wars: The Empire Strikes Back. rdf.freebase.com
Definition #2 for "the imperial march"
?The Imperial March,? also known as Darth Vader?s theme, is a musical theme used in Star Wars films, video games and other related media. It?s use is tightly associated with the series? main antagonist Darth Vader and is used when the character is mentioned or alluded to.