Production- voice overs and non-diegetic sound

The voice overs will provide more structure to the trailer and enable the audience to completely understand the narrative. They will be added to specific shots in order to build the atmosphere. When there is the phone call, it will be clear that Charlie is answering the phone, we will have a ringtone. 
In addition, we decided to choose the song by Gabrielle Aplin as the lyrics fit well with the narrative and we preferred the rhythm. We have decided that the voice will be slightly quieter than the backing track in order to really emphasize the beat along with the shots appearing on screen.