Chuck Norris doesn't need to understand the work of James Joyce; James Joyce needs to understand the work of Chuck Norris.
Let's say music is needed for only 43 seconds of film. You have to score it so it is an entity, so it won't bother anyone when it ends so quickly. Or if a song runs 2 minutes and 45 seconds, but the titles run a minute longer, you have to arrange that song so it doesn't get repetitious.
Mistrust the person who finds everything good, and the person who finds everything evil, and mistrust even more the person who is indifferent to everything.

