This could be cave music, or forest music. You can use it however you want.
I think It could work for the levels: Ancient Ruins, A Mouldy Grotto, Crumbling Path, and Going Underground. However, you could also use my Forest Cave music for some of these as well.
https://ufile.io/d64vk
Let me know what you think. I can also upload a version without birds in the background if you'd like.