__ Merrily on High; Carol With Gloria Chorus
Puzzle 18 of Christmas Carols Piece of Cake Pack
Question is: __ Merrily on High; Carol With Gloria Chorus
and the answer is: DINGDONG
Word Meaning:
DING DONG — (onomatopoeia, colloquial, often childish) The sound made by a bell; especially, that made by a doorbell.
Definitions from Wiktionary.