Actually, finding some different stuff to sing should help a lot. I am very tired of the over used stuff--Silent Night, et. al. When we did the Decorating Party at the Nursing home, Dana brought a book that had a lot of "obscure" stuff in it, like Bring a Torch, Coventry Carol, Boar's Head, Cherry Tree, etc. Granted, it is not that "obscure" to "our kind", but most people have never heard this stuff. My dad was the only person I ever knew that sang "I Saw 3 Ships".....and the melody is EZ. If you have/can play piano, go through the melody line once or twice so they can hear it. That always helps, too.