Advent song for December 16

I’ve watched this video twice to see whether I can make any sense of what’s supposed to be going on, and I can confirm that I have no idea. I can’t quite bring myself to look it up, but should you happen to know, feel free to post a comment.

There’s nothing Christmassy about the song, but it was Christmas number one in 1981, and what it lacks in yuletide spirit it makes up for in eyeliner. And it’s a great song, although listening it to it now I can’t imagine how anyone ever danced to it, even though I have distinct memories of it as a school disco staple. Perhaps we all just vaguely shuffled from foot to foot looking at the floor. After all, that was what we did with every other song.