Sound

Finding royalty free music for our trailer was a difficult task, as I felt that music was a crucial element for trailers. We wanted to use two different main tracks for the two main sections of our trailer - firstly the Mother and Rosie playing happily, and then when she goes missing, and the investigation/hunt begins etc. We deliberated having happy, upbeat music for the first section, however decided on 'Insidious' as it is slow, and unnerving, so would cause audiences to be apprehensive and engaged from the start of the trailer.
For the second section we decided on a dark and eerie version of  'Pop Goes the Weasel'. We felt that as our victim in a young child, using a distorted nursery rhyme would be distressing, but suitable for our plot and genre. We wanted a track that built in intensity, so that we could synchronise the editing pace with the building beat of the music.

Sound Effects:

Through research I found that several non diegetic sound effects are often used in trailer, to emphasise certain actions or events. As our trailer is of the crime thriller genre we are planning to include police sirens, as these are immediately connotative of danger, crime and justice. Here we have also found childish giggles which could be used throughout the trailer, and also a ticking clock noise to create suspense.