In film production, the term diegetic refers to a sound that occurs within the story itself that the characters supposedly hear, whereas non-diegetic sound refers to background music or narration. For example, the tune played by the pianist in Casablanca is diegetic, while the stirring background music during the training sequences in the movie Rocky is non-diegetic. Diegetic comes from a Greek word that means narrative. This is part of a complete episode.

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