Drafting and Planning

Sound is going to be a great part of my teaser trailer as I am going to need it to create things like tension and suspense to keep the audience engaged whilst watching it. This can be done by Diegetic and Non Diegetic sounds. Here are my definitions and examples of why it is important:

Diegetic - Sound whose source is visible on the screen or whose source is implied to be present by the action of the film, voice of characters or objects in the story. For example a scream of someone or creaky floorboards so it makes everything more dramatic and scary. 

Non Diegetic - Sound whose source is neither visible on the screen nor has been implied to be present in the action, it's represented as a sound outside the story place which are like sound effects, mood music and narrators commentary. For example a scary children's rhyme in the background of a swing swinging slowly in the dark. It would create suspense. 

I would like to use both of these ad I think they would make my teaser trailer a whole lot better as everything will be more dramatic and scarier.