So what kinds of music are played in your fictional world? What music does your main character enjoy? Does it say something about their personality or do they deliberately choose to like a kind of music which is generally unexpected from those who know them well? Or is your world an austere one where music is suppressed? (After all you can express almost anything through music which, for a dictatorship, is good reason to suppress it). The way a government treats musicians, writers or whoever can express ideas artistically can be a very good indication of how it treats the populace at large.
Do your characters sing? If so, in which style? Is dance enjoyed on your fictional world? What would we recognize? What is unique to your created world? Why has music, dance etc developed in the way you have portrayed it?