First, the Coventry Carol.
This song is one of the saddest Christmas Carols I've ever heard. We should be happy, right? Jesus is born!
Well, yes. Born to die, horribly, for us. And the world attacked him from the moment he was born, as referenced in the second verse. Not very happy, that.
But as a refresher, quite possibly the most beautiful carol of all time. Turn the volume up as high as it can go: