Sound used in Jaws

Diegetic - within the scene
Non-diegetic - added afterwards in post production
Crescendo - build up of sound/music
Diminuedo - gradual 'die away' of music
Sforzando - sudden sharp sound

In the second scene in Jaws the director uses diegetic sound when on the beach with all of the peoples voices and music from radios. Spielberg uses non-diegetic sound when it shows the sharks P.O.V; he also uses a crescendo when doing this.
In The Godfather 1 scene where Michael shoots Sollozzo and McCluskey the director uses all diegetic sound which mostly crescendos but at the very end of the scene after he shoots then there is non-diegetic sound which is very suspenseful.