I couldn’t think of any songs about, or even mentioning Boxing Day, but a quick YouTube search came up with these two.

First Elvis Costello performing TKO (Boxing Day) on Tyne Tees TV’s The Tube after the programme had gone off air but with the cameras still running (obviously)…

And in a pub in Derbyshire  on Boxing Day 2008 here’s Helen Morris performing her self-composed Boxing Day Song…