Christmas melodies

I know, wrong time of year, but as you may know I am currently working on the advent calendar. Now, Originally I wasnt planning to have any music in this calendar, but damn it, there are so many beautiful melodies I feel like including. I will play piano melodies and sometimes include some lyric-free vocals, and there will be different melodies for the different cultures, though the other days will just have general Christmas songs.
Now, the problem is just that a lot of the cultures I include here are cultures that havent traditionally celebrated Christmas, and as such there arent really any Christmas songs to speak of from them, at least not that I know about. However, it doesnt necessarily have to be a Christmas song, the one I have chosen for Imperial Russia isnt a Christmas song, and so I figured I would ask you guys, cause there may be some of you who at least know of some melodies from these cultures.

Here are the cultures I already have melodies for:
-Norse (Mitt hjerte alltid vanker. Norwegian Christmas song)
-Imperial Russia (Fly on the wings of the wind. Song from a Russian opera called Prince Igor)
-Rococo (Oh holy night. French Christmas song)
-Ottoman empire
-Chinese Han dynasty
-Celts (Auld lang syne)

Cultures I need melodies for:
-Sioux
-Inca
-Czhechoslovakia
-Ainu (northern Japan)
-Nubia (culture close to ancient Egypt)
-Maori
-Zulu
-Inuit
-Sámi

If I dont get any suggestions, I will just have to choose generic melodies from other cultures, but it would be nice to get something genuinely from the cultures in question.

Please only suggest songs that are in public domain (folk songs and songs that are over 100 years, for example), because DA does not allow the use of copyrighted music.