If the music department isn't already overloaded with work, I think it would be really fun to have some music scrolls that aren't from any world in the Spiral, sort of like the three Yuletide music scrolls that we already have, but for different occasions. For example, there could be some music for other holidays, like Valentine's day and Halloween, St. Patrick's Day and of course I would love more summer music, like maybe some tropical, Hawaiian-ish music.
Also, remember that video from KI of the staff singing that "on the twelfth day of Christmas, a wizard gave to me" song? I would love to have that in music scroll form. https://www.youtube.com/watch?v=thwPD5i7DIc