Thanks for the reply! I was concentrating on the music specifically. I thought the lyrics generation was really enjoyable.

I was asking more if you'd used any traditional carols, as they can have a more definitively "christmassy" sound than a pop song with sleighbells laid over the top.

Overall I meant that I think the music would be more convincing either following the chords in the melody, or sticking to a single mode for both melody and accompaniment.