Agree. I love it so much, I read up about it.

The song is was written by a Ukrainian and is called Shchedryk. It was originally a New Year's song; when Shchedryk was written, the Ukrainian New Year was in April, so it's actually a springtime song, and has nothing to do with bells.

There are some simply fantastic recordings of Shchedryk sung in Ukrainian; although (or maybe because?) I don't understand Ukrainian, I find these more beautiful and moving than the English lyrics.

Edit: several articles (words) were dropped, but only articles. So I have either suddenly a weird sort of brain disease that affects only some parts-of-speech, or ... well, that's the only reasonable explanation. Anyway, edited to fix.