Welcome to France, and a carol which I would translate as “What is that nice smell?”, but which Wikipedia tells me is more usually rendered in English as “Whence is that goodly fragrance flowing?”, which I suppose is more holy-sounding. This is  a traditional carol from the 17th century, and you have probably heard it before, but it’s very lovely, so here it is again, sung by Les Petits Chanteurs du Mont-Royal (“the little singers of the royal mountain”?). There is something very enjoyable about watching small boys concentrate as they sing choral music, and some of these small boys are concentrating very hard indeed: