I LOVE Christmas music. Overall favorite album is definitely A Charlie Brown Christmas by the Vince Guaraldi Trio. Favorite song right now is a tie between Mel Torme's version of The Christmas Song and Eartha Kit doing Santa, Baby. Gawd, she has a sexy voice.
My least favorite... Well, just about any Christmas song can be made insipid by a bad rendition. The religious ones seem to fall victim to that scourge most often. The Little Drummer Boy is a case in point. I can't stand Bing Crosby's version of it, but there is at least one version of it that I like, so I wouldn't count it as my least favorite. I think my least favorite would probably be Joy to the World. It's just too bombastic. The last thing it could inspire in me is joy. It sounds kind of like, "God's here!! God's here!! Everybody smile, and act like you're having a good time!!"