I find that with every book my muse changes. Whether it be a song or a person. Currently, my muse is two songs: Eyes open by Taylor Swift and Both of us by B.O.B ft. Taylor Swift. Both songs have such powerful lyrics and the actual music itself is fantastic. Musics has always set the mood and tone for my novels. As well, I like to give my characters a theme song in a way. What is your current muse? Or, what are your muses?