Interesting... I sent you a friend request on Discord. I'm a music composer and it would be nice to help. Here are some examples of my work, although there are no examples of mystery music, I can send you one via Discord DM:
https://youtube.com/playlist?list=PLtIg4_xTCwzS6vyra9GhF25rZ8lABZOUd&si=j5UwhCFU...