Always thought this was more of a Pagan type song but turns out it is a bona fide traditional Christian tune, dating back to the Middle Ages, no less with 'Ii dulci jubilo' and the rest of the original words being a maceronic (good word) mix of Latin and German.
In 1975 ye good olde 'trad Dad' Mike Oldfield brought the tune into ye moderne age - forgetting all about the words - with this jolly interpretation of In Dulci Jubilo which gets duly pulled out at folkie Christmas gatherings, and quite rightly too. Our Mike does so like to do things all on his own, and here's a classic video performance using 'modern' film techniques to show him playing all the instruments at the same time. Must have been hell to synch back in the 70s.
So, good Christian men (and women).. Rejoice! .. and jig around a bit too to the multi-instrumental talents of Sir Mike of Oldfield....take it away Mike: