What Is Film Music? Why Do We Need Music In Films? Film music is written specially to enhance the emotional and dramatic aspects in the film. Film music often comprises of numerous elements, such as orchestral, choral, and sound effect in various styles. Each piece of music in a scene is called a cue. Theme in films: A theme in a film is known as leitmotive, which was derived from operas in the Romantic period (19th century). There is usually a theme associated with the main character. When the main character changes his/her mood in a film, there will be a variation of a theme associated with that scene. This is common technique film composers use to make films very memorable and meaningfully support the emotional aspects. Think about the movies: Star Wars, Jurassic Park, or Indian Jones.