It is probably a reflection of my now being into my fifth decade that "sad"/"moody" pieces of music I find the easiest to identify with. (I do love more upbeat works too but I recently wrote a piece for Chandler's Ford Today about My Top 10 Classical Music Greats and the majority of them were string arrangements which alll conveyed an air of melancholy!).
So what kind of music is the favourite of your characters? Does this reflect on their basic traits or is it something completely different? (We all need our forms of escapism after all). Is music celebrated in your fictional world or is it something only for the privileged few?
Are there concerts put on for the masses (like the BBC Proms to name one example) or do musicians play for those who commission them (which would almost certainly limit their audience to the rich)? Is any type of music banned on your fictional world and, if so, what and why? Does this ban stand firm or do people get around it by listening to it "underground" (literally if necessary!)?
Some story ideas there I think!