The library's reading ideas calendar had this for today: "Play music and dance to the beat. Stop the music and have your child freeze." The kids and I did this tonight and we had a blast. We put on several songs and they were pretty good most of the time about freezing when the music stopped. Sometimes they were laughing and making so many sounds that they couldn't hear when the music stopped, but it was still fun.
By the way, we did read some books later as well.