Genius.
Sure reminds of all the years I spent listening to the organ at church. The backgrounds are amazing how it dances the air through all the pipes while the deep ones continue. The melody gives it the light fantasy fantasy town feeling.
Have you tried a spooky organ version? May try with some Mozart-style rhythms. Mozart wrote some haunting stuff.
Oh lord, I had to conduct requiem in my University exams... I had such trouble with Lacrimosa and Tuba Mirum... They weren't difficult as such, I was just a nervous wreck during those for some reason. Perhaps over practiced... This brings back haunting memories!
I did indeed plan on the first 'proper' track to be something expressing trouble brewing so I may just follow your suggestion!