Sister’s pick:

 ”Sing Jingle Bells in a round.”

First we discussed what a “round” is.  Laurie Berkner has a lovely song called “White Coral Bells” that she and her band sing in a round. (It’s on the “Victor Vito” CD.)  We talked about what that song sounds like and how we could do the same thing with Jingle Bells. Then we tried it.  As expected Sister quickly jumped over to the second part instead of staying on track so I suggested she cover her ears and we tried again.  A couple times through successfully and we stopped.  As Sister was walking off I heard her say in a disgusted tone, “I bet Laurie Berkner doesn’t have to cover her ears.”