common singing of carols, carol singers in Poland, (Christmas) carollers  or carolers in Poland
<a href="//commons.wikimedia.org/w/index.php?title=User:Fiberek&amp;action=edit&amp;redlink=1" class="new" title="User:Fiberek (page does not exist)">Fiberek</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>