Many authors that I know talk about the songs that influence their writing, or that they listen to while writing. Some even go so far as to have playlists at the end of the book matching a song to a particular chapter or scene. Well, I do listen to music while I write, but not necessarily specific per chapter. Interestingly, the playlist for Do No Harm was comprised of songs exclusively from the Two Steps From Hell composing team of Nick Phoenix and Thomas Bergersen. Originally, they composed music for movie trailers, TV commercials and other entertainment industry uses. The music became so popular on YouTube that TSFH started composing and releasing music for the public, with fantastic results. So the DNH playlist came entirely from their recent releases in the Epic genre. Here's an example: