This is how we played:
Two teams lined up behind a table. The first person in both lines put their hands behind their back and stood in front of a table with a call bell in the middle. I showed them a Christmas Tune Flashcard and the first person to ring the bell with the correct answer earned a point for their team.
Some of the tunes were difficult for the students, so I told them their team members could help them by clapping the rhythm or quietly helping them sing the tune. The kids had fun and the game became more of a team effort than an individual one, which is often more exciting for the group lesson.