Fum, Fum, Fum (pronounced foom, foom, foom) is a traditional Catalan Christmas carol.
It is thought to have originated in the 16th or 17th Century. The name, however, is not a Catalan word or phrase (actually, fum means smoke in catalan) and is considered to be an onomatopoeia of the sound of the strumming of a stringed musical instrument.
This is my Arrangement and interpretation. Enjoy!