An old tradition in Wales was Plygain - singing from 3-6am on Christmas Day.
In the early hours of Christmas morning, men gathered in the rural churches to sing. They would sing mainly unaccompanied, three or four part harmony carols in a service that went on for three hours or so.
After Plygain, Christmas Day feasting would begin.
The tradition has died out in much of Wales but can still be seen in Montgomery and at St Fagans Museum.