I know there is a music patch floating around but the creator himself said it wasn't very good but I wanted to see if it's possible to change things and not sure if this is right but according to this (https://gbatemp.net/threads/complet...-in-the-sky-sc-psp-undub.445307/#post-6751526) all you need to do is change the TOC so the game will run the files in the ISO instead of the one it has in memory.