Diegetic- Sound comes from a source within the scene- dialogue, actors, or even music from a radio.
Non-Diegetic- Added to the soundtrack to heighten impact or create an emotional response.
At the very start of the trailer a piano can be heard, since you cant see the piano in the scene this would be Non-Diegetic sound, the piano sound creates a mysterious effect, linking in with the strange masked creature we see at the start.
Around about 1 minute 10 seconds in we can see a fight between aircraft's going on in the sky as hear explosions going off, this is known as Diegetic sound as we can clearly see where the source of the noise is coming from, this lets the viewer know exactly what is happening within the scene.
Near the end of the trailer we can hear the Star Wars tune, this is also Non-Diegetic which is added in so the viewers know what the trailer is for and for them to remember this is the star wars theme tune. This not only helps people recognize it but it also sticks in people's minds and the next time they hear it, will know it is Star Wars based.
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