The root of any film project for me is this inner need to express something. What nurtures this root and makes it grow into a tree is the script. What makes the tree bear flowers and fruit is the directing.
Songs come from all over the place. You can't predict what you're going to like. You might like something that doesn't fit right now. What was working for you at one point, something you've loved for years and years, when you get together with everybody, you think, this doesn't match up with what's going on with you personally.