Research and Planning: Analasis of sound in teaser trailer

The establishing sound is a sound of sirens which immidiatley shows the genre is horror, it is non diegetic because it is not visible on the screen, then western music (also non diegetic) is played to show the setting and atmosphere of the film. The music gradually fades out and then diegetic sound comes in which is the crash of a car. Then the films theme music is played (non diegetic) to build tension and get the main plot and feel of the film going. The theme music then fades out and there is one background noise still playing to build tension (non diegetic) then the mood music gradually starts to build up again to a point of action where a series of diegetic sounds can be herd such as screaming, fighting, banging e.c.t. Then to finish the trailer off the mood music comes back in and fades out getting quieter and quieter.