Western-ish tuning and harmony with some independence in the lines. I'd guess hymns influenced this at some point.

It would have been really interesting to hear original pre-contact music.

My ethnomusicology teacher (Charles Keil) ( I didn't really ever study that, though) has a good friend (Steven Feld) who was doing stuff with some people who were more remote. https://folkways.si.edu/voices-of-the-rainforest/world/music...