Question: what are the four main functions of film music?
Answer: Commenting. This is a function that shouldn't be overdone. ... 
Illustrating Movement. Another function that feels rather old fashioned and comedy. ... 
Creating Plot Relationships. ... 
Create Atmosphere. ... 
Portray Emotions. ... 
Social/Cultural/Geographic References. ... 
Time/Period References. ... 
Connect Scenes/Montages.