As requested by Mike, both this time around and back in 2011 when I got everyone to tell me their favourite Christmas songs without telling them why. Last time I accidentally gave this song to someone else before realising it was the same one Mike had requested, so this time, Mike, it’s all yours.
This is actually an advent carol rather than a Christmas carol, so this is the time to be singing it. I have tried to find out a little of its history to share with you and make me sound learned, but I have discovered that you need a better level of general theological knowledge in order to understand even the basics, so I shall direct the curious to Wikipedia and let the rest of you get on with listening to the song. Happy Advent!