The World According to Jonathan Who's the Boss? : Season 6 Episode 11

Some bad experiences at school, including being assigned to play the accordion, have Jonathan's self-esteem at rock bottom. Tony helps him overcome his depression by introducing him to an old friend of his, who is now an accordion player. Jonathan soon enjoys playing the accordion, but when Tony encourages him not to restrict himself to one activity, Jonathan misinterprets Tony's intentions as disapproval for the accordion, and bans Tony from his first recital.