The preschool has a visitor Liz, a musician. She shows the kids all sorts of instruments and Caillou is excited when hes chosen to be the orchestras conductor. In fact, hes so excited, he cant stop conducting those around him at preschool and even at home! When Caillou refuses to share his conductors baton he soon learns how easy it is to hurt others feelings and how it feels better to give others a turn.