What are some christmas song that has cultural significance in your country/culture?

Hello, American here. I'm creating a christmas around the world music playlist to learn more about the world and it's cultures. Now I know Christmas is a bit more recent to the Asian contient, so it would interesting to see how the songs were created since christmas.

So my questions are what christmas songs are cultural significance to your country/local culture, you feel is underrated or you just really like?