How long after Christmas day can you keep on playing Xmas music?

It’s something I’ve always wondered. Christmas music – should we stop playing it the day after Christmas Day? It seems a bit harsh doesn’t it?

Is it permitted to play it all the way up until the Christmas tree gets thrown out? And should we decrease the number of Christmas-related songs played after Christmas day until January kicks in?

I think the reasonable answer is to have it on in moderation until January (moderation being one of my life rules). Best to keep it varied and not too intense to save our souls and keep us from all going mad.