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.
“Anytime James Carville, Paul Begala and David Axelrod hold hands and jump for joy, it's worth pondering how to turn their joy into tears.”
“I don't like losing but I've mellowed. I maybe have a short fuse but it goes away quicker now.”