Well, I was able to get into the files via a recent build of Thimbleweed Park Explorer I compiled, and I am convinced the music is in this file:
https://www.mediafire.com/file/22ji6dujpqr1l9u/Music.assets.bank/file
This file may have something to do with it as well:
https://www.mediafire.com/file/z8jpypznmz7gexa/Music.bank/file