Clementine’s big brother Billy has a new drum set and is having lots of fun playing as loud as he can. He won’t let Clementine and Caillou play his drums though, because he says they’re not grown up enough. The two friends set out to prove him wrong, and once they put on their ‘grownup costumes’ he finally relents and lets them play. Caillou pretends he’s a rock and roll drummer playing a big drum solo!