This document discusses different elements of film sound, including diegetic and non-diegetic sound. Diegetic sound originates from visible or implied sources within the story world, such as voices, music, or sounds made by objects on screen or off screen. Non-diegetic sound comes from sources outside the story, like narration, added sound effects, or musical scores. Film sound can also be synchronous, asynchronous, or contrapuntal to reinforce or create alternative meanings relative to the visuals. Other elements discussed are voiceovers, theme music, musical scores, and the use of silence.