I don't know how complicated this would be but I think it could only be done through mods.
What I was thinking you could do, is that you could add music to when a person discovers something in their world. For example when they discover the first Hell, you could add a track that is eerie and dark.
Also when they discover the underground oasis, you could add a track that is mysterious and adventurous if you know what I mean.
You could also add tracks to when they are walking through caves, music that is really adventurous and uplifting.
Another idea I had is for when a person discovers a wisdom scroll/blueprint, you could add a 5 second track that is somewhat like a congratulatory sound. For example when you rank up in Call of Duty, there is a short soundtrack that is played. Something like that.
These are just a few ideas and I hope they help in some way.