Diegetic sound purports to come from the world of the film. This includes, but is not limited to: sound recorded on set, foley effects, dialogue (including ADR – Additional dialogue recording).
Non diegetic sound is that which is added in post-production, to create an effect on the user.
A composed score is music which is composed specifically for the film it is shown in. Composed scores include theme songs.
A compiled score is pre-made sound which is used in the film.
Narration (Voice Over) and Direct Address
A sound bridge is music which continues from one scene to another. The music can change from Diegetic to Non-Diegetic, as this happens.