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.
“I was a Christian. I didn't want to have sex before marriage, I was a bit uptight and not very self-confident. I was a virgin until I was 26.”
“When I stopped doing ballet, I started training in the pool. I would do my barre exercises in the water, because that prevents injuries.”