Tubby misbehaves at rehearsal, and the conductor tells him to leave. Defiant, Tubby joins a marching band. It's fun at first, but all the marching finally wears him out. He can't even OOM-PAH anymore, and he longs to get back to the orchestra. Tubby escapes and runs home once again where he finds that all his friends missed him, too! Tubby realizes he belongs in the orchestra, and it makes him very happy.