Often people will ask me why a song was chosen and I don't always have a good answer for it. You try ideas and something works or sounds really cool. Sometimes songs are on the nose and sometimes they're more mysterious.
Music licensing is a strange business to navigate, and all kinds of little things can drive a price up or down. It's completely fluid, it constantly changes, and there's no list of prices on a menu. Everything is negotiable in every way.
The number one success in music supervision is when you can satisfy everybody on every level, creatively and in terms of the budget. That's when I'm most stoked, when we can balance the left-brained stuff and the right-brained stuff.