Cover via Amazon Wagner made several contributions to classical composition, the most important of which were the leitmotif and his use of dissonance. In a nutshell, the leitmotif essentially gives each and every character in Wagner's opera their own specific musical motif, or theme music . Wagner's concept of the leitmotif has translated well into modern film composition. In fact, every film composer knows that he or she must devise a theme (or leitmotif) for the protagonist and antagonist of the film. This musical cue gives the audience an aural "heads up" that a specific character is about to enter the scene or plays an important part. For example, in the movie Jaws , John Williams assigns a particular motif based on minor seconds to the shark. Every time one hears this motif, the audience knows that the shark is out there, somewhere. Stephen Spielberg and John Williams (as well as Tim Burton and Danny Elfman ) have a very unique director/composer relati...