I usually play the same song on repeat while writing the first draft of a chapter, and I tend to pick a song that corresponds to the mood of the section I’m working on. Since most of the novel is narrated by Aiden, I ended up with a lot of alternative and some grunge. For Cole’s POV chapters, I often went with Zoe Keating’s experimental cello pieces. I also chose a lot of music from the mid-2000s to take myself back to 2007.
Disclaimer: I’m not getting paid to advertise for the artists listed here. I simply like their music!