The soundtrack to a trailer has many varying functions. The soundtrack consists of both diegetic and non-diegetic sound, which thus includes dialogue. It helps the audience make sense of the narrative by giving them background information, this is especially referring to dialogue or even a voice over if the trailer includes one. Although, the type or genre of non-diegetic music can also hint at background information such as where the action is set, diegetic sounds also do this. For example, if you heard really modern music, you'd perhaps assume that the film has a modern setting. To accompany this, if you heard diegetic sounds of busy people and cars, you'd assume the setting is in a built up area.
The soundtrack also informs us about the characters, primarily via dialogue, and also showcases the stars appearing in the film which would be done by a voice over. A voice over would also give the audience information about important production personnel such as the director and producer and their previous works. A voice over could possibly summarise the story in around 5-8 lines. This is to aid anticipation but still doesn't give away too much about the story line. All forms of sound in the soundtrack would be used to help build anticipation about the films release and set the tone for the film. For example, if the trailer includes up beat non-diegetic music, then this sets a happy and positive tone for the film. Non-diegetic sound effects would be used to reinforce the title of the film.
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