WHAT DOES MUSIC DO IN FILM?
When music is combined with moving pictures, it tells us how to feel about what we are seeing. It's power lies in it's emotional suggestion and commentary on the film.
And music doesn’t just tell us how to feel, it is my assertion that when it is combined with other communicative mediums, music is the PRIMARY element that is directing our feelings. This means that the audience will follow the emotional suggestions of the music OVER those of the film if and when there is a conflict between the two. This is because for a film to get to your heart, it has to lay out exposition, craft setups, and do the hard work of capturing your attention and building your trust just to get you to be emotionally invested enough to be moved when the love interest dies. But music doesn’t need to do all that; It can get connect with your feelings in a matter of seconds.
This opens up the opportunity for the music to wreck the director's intentions if the music is telling the audience something that conflicts with the goals of the story.