You've been bringing your baby to music class. They smile and giggle. They clap their hands. They look up at you adoringly. It's clear they love music. Then they start crawling. Suddenly they're sliding across the mat to get a closer look at another baby. They're grabbing everything in reach. A few months later they're walking, wandering around the room and pointing at seemingly everything in it — anything but actually participating in the music. So what happened? Maybe the t