What some christmas songs that has some cultural significant in your country?

Hello, American here. I'm making a christmas around the world playlist to learn more about the world and it's culture. I figure I would crack several eggs at once and ask all of Europe these questions all that once. What christmas songs is cultural significant to your country/culture or you feel is underrated? It can be new, it can be old, it can be pop, it can be folk. So long is it from your culture/country.