Any kind of anthemic song for the most part they're on the positive side of things. It's not hard to identify when a melody is just one degree too complicated or one degree too simple and where that line of pop memorability lies.
And of course pop music is all about memorability and simplicity and positive messages and a little dash of joy.
I mean certainly writing painting photography dance architecture there is an aspect of almost every art form that is useful and that merges into film in some way.