I love listening to music when it comes to designing, and developing characters. I've found it helps strengthen and support who they are, where they come from, where they want to go, where they are actually going.
I have several themes thought up. I will list them for each thing I am feeling, or what my character would be doing with that track in mind.
Tea Weevil store front theme, also Sebastian's theme when he is calm: www.youtube.com/watch?v=3zd6QvtJzEg (FYI: The track for this is in Secret of Evermore its called The Queens. Its original track is supposed to sound medieval-ish but this remix with the flute, shaker, strings.....makes it sound more desert-ish like my characters desert motif. Jeremy Soule is a genius.)