The science behind Christmas songs involves nostalgia, neural pathways, sleigh bells and, yes, Michael Bublé.

Christmas hit songs: How much money can you make from a Yuletide tune? Noddy Holder says it’s ‘like winning the lottery every December 25th for the rest of your life’ Expand ...

It’s a swizz: both belong to a large class of winter songs that have been shuffled cynically on to the Christmas playlist ...