It's an interesting phenomenon (possibly) that a lot of things that I would try to avoid most of the time become strangely palatable around Christmas. Like mince pies - I don't really like them, normally, but can't help myself come December. And a more common example, of course: sprouts.
And as far as tunes are concerned, there are, I think, three Cliff Richard numbers on high rotation during the festive season. That would be a frankly alarming propsect under normal circumstances, but Christmas without Cliff just doesn't seem right any more.
A slightly more bizarre variation on this theme features as this week's Sci-fi Santa Song of the Week: A Spaceman Came Travelling, by retired bin man Chris de Burgh. Completely mental nonsense about a spaceman who travelled for light years of time to bring a message for mankind to hear. Utter drivel really, but hey, it's Christmas, peace and goodwill to all men. Even Cliff and the de Burgh fella.