Mickey conducts a radio orchestra who performs the Light Cavalry Overture (by Franz von Suppé). The sponsor (Pete (Disney) as Mr. Sylvester Macaroni) loves the rehearsal and agrees to have it shown in concert. On the night of the performance, everyone is soon ready, except, of course, for Goofy, who accidentally drops all the instruments under an elevator, severely damaging, if not outright destroying, all of the instruments, thereby ruining the instruments' ability to make musical sounds. Macaroni and Mickey are completely unaware of the unfortunate mishap until the orchestra starts to "play" the damaged instruments. Throughout the outrageous concert, Mickey struggles with anxiety while Macaroni throws tantrums from inside of his private viewing room. Macaroni is reduced to tears when the concert ends, believing his reputation to be ruined. But he suddenly lightens up when he hears the thunderous applause from the audience.