When writing, I create music playlists to help get my ideas going. Usually, I don't listen while doing the actual writing, but I do listen while walking around, commuting, etc. I try to get myself into the headspace of the characters and situations. It's all about tone and feeling.
I don't remember how I found "Swannanoa" by Water Liars, but once I did, it connected to everything that I've been thinking about when it comes to the story.
This is one of those songs that I'll replay at least 3 times in a row before I'm ready to move to another song.