Skim [reading quickly to get the main idea] the following website: https://www.robin-hoffmann.com/tutorials/what-is-the-function-of-film-music/. On this site you see different functions for movie music. While skimming, think of your favourite movies. Does one these functions fit your the movie you are thinking of? You can also watch the videos to get a better idea of the different functions.
You might now have some basic knowledge about the functions of movie music. Discuss with your partner which functions you found most interesting.