Final answer:
Early film music served to cover projector noise, add expressive depth to black and white images, engage audience emotions, and make the film experience more of a fantasy.
Step-by-step explanation:
Early film music served multiple roles in enhancing the movie-watching experience. It covered noise from the projector to create a more immersive environment.
It also added expressive depth to black and white images by conveying emotions and enhancing storytelling.
Additionally, film music engaged the audience's emotions and made the film experience more fantastical by creating a heightened atmosphere.