Cool job! I am afraid I won't have the time to read all your short stories before the deadline with enough detail to judge properly, so these are my impressions of just the world and the music. I really appreciate the great detail you put in your creation, describing the societies and the interactions between the four cities and how they play a part in the events happening in your world. The music accompanying each of the settings was also very cool, and it was really surprising to me to experience for the first time a more or less typical fantasy setting but with a jazzy vibe!!! I must confess, though (but take into account this is because my musical ear training leaves much to be desired), that many of the harmonic subtleties of your arrangements were probably lost to me, and this resulted in the four cities all sounding a bit similar.
Overall, I had a really pleasant time with your entry, and your work felt very polished and complete.