trying to identify an animated movie?

I really need help finding this animated movie. I think it might have been a christmas related movie with a nativity scene of some sort, but all i can really remember is a bird singing a song. The song the bird sang was on a roof top and had the line..... "the song of love" don't remember any more. I know its extremely vague but any help in the right direction would be greatly appreciated because i have had this very short piece of music stuck in my head for the past 15 years.