There are lots of Polish carols. We decided to sing just three of them that you can watch on youtube
There are the links for other versions of those carols:
Przybieżeli do Betlejem pasterze: https://www.youtube.com/watch?v=SVEIRh3G-ZU
Dzisiaj w Betlejem: https://www.youtube.com/watch?v=MnQ4_10Te-o
Cicha noc: https://www.youtube.com/watch?v=6zpHP4hj6wM
You can try a karaoke:
https://www.youtube.com/watch?v=n8idJ1Mqqn4