This document discusses different types of sound that can be used in films, including diegetic sound that is part of the scene and non-diegetic sound like musical scores. It notes that most films use both types of sound simultaneously. It then defines various musical terms like crescendo, sforzando, atonal, and contrapuntal that describe how sound and music can be used to build tension or undercut drama. It also mentions how minor and major keys can be used to set different moods and how motifs can represent characters.