I'm just thinking of the recent history of Cincinnati radio stations playing continuous Christmas music on Christmas Eve and Christmas Day. In the late 1950's, WCKY-1530 AM- aired what they called "24 hours of Christmas" with Christmas music from 6 P.M. on Christmas Eve to 6 P.M. on Christmas Day. I never understood why they stopped at 6 P.M. on that day. The station later expanded to playing the music until Midnight. Later on, as I recall, they began playing the music at Noon on Christmas Eve, making it 36 straight hours. At one time, they took out a full-page ad in the Cincinnati newspaper to list all of the songs that would be played. Interestingly enough, some of the recordings played during those hours were not Christmas songs. I never understood that either.