I've heard the song before. I hear it only once a year, and only that once, exactly in December. It's a silly rhyme about jingling bells, describing things I have never seen such as snows and sleighs and reindeer. A fat fellow in a red jumpsuit is supposed to be entering houses through their chimneys and leaving gifts.

In Thailand, Christmas starts early in December. Since it's a Buddhist country, they probably don't realise it's all supposed to end around December 26. Last year, there were giant Christmas trees and Jingle Bells and Rum-pa-pum-pum in public places well into February.