Hi, Gayle.
Welcome to the forum! I had a listen to the sampler, as well as "O Come, O Come, Emmanuel". Nice arrangement!

I see you wisely avoided the version where the verse only rhymes on the printed page:
O come, Thou Key of David, come
And open wide our heav'nly home;
Make safe the way that leads on high,
And close the path to misery.That's a lot of music to put together, and you and David did a great job. Congratulations to you two!