When Caillou visits Clementine, he is impressed to see Billy practicing on a Tuba. Soon, Billy's marching band mates arrive to practice. Clementine and Caillou wish they could join in too. They make their own pretend horns with cardboard tubes. Also, on a winter evening, a strange sound grabs Caillou's attention. He follows the sound to find out its source. Caillou continues his search and discovers Gilbert in his room, having a great time playing with a baby toy. Later, Caillou goes up to the attic with Mom and finds a box containing a teddy bear and a music box. Caillou and Rosie find a way to share these treasures. Caillou gets a special invitation to go to André's gym class. A little intimidated at first, Caillou tries his best and ends up having great fun. Caillou finds the leap-frog exercise difficult but he keeps trying and finally succeeds. Caillou learns to deal with a change in plans, when Daddy has to use the car and Mommy and Caillou have to take the subway. Caillou has fun
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