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Tell me, is it possible to change the music in the game? How do I do it? For example, can I put my favorite music in a specific town?

Go to the folder where you have the game installed; there's a folder called "music." If you understand English, you'll find folders containing music for entering a town, battles, and so on. For example, there's a folder called "Town-Themes," which contains music from all the towns (or so it seems). Take the song you want to use instead of the standard music and put it in this folder (preferably, the song should be the same size as the standard music). Rename the song to the same name as the old music, delete the old music, and leave the new song.
P.S.: I think I explained it a bit clumsily, but I hope you understand.