I am really impressed by lawyers who write books and tell us that they never lost a case. Most lawyers who have never lost a case have not had enough hard cases. But there are very difficult cases out there.
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.

