Brazil 

This article mentions that "Sam Lowry of Brazil hums/listens to/sings the film's self-titled theme song" but I'm not sure if that's metafictional.  The song is not named after the film; rather, the film was named after the song.  I don't think that this character's attraction to that song is at all related to any sort of idea of him being a character in a film. 70.61.247.31   ~Mike R.