Plot
Jimmy Connors, a student at Riverwood High School, is the drummer in the school brass band but dreams of playing in a dance orchestra. After school, Jimmy convinces his friend Mary Holden to be a vocalist. Late one night, Jimmy persuades Mr. Judd, the school principal, on the idea of forming a dance orchestra. Mr. Judd is reluctant due to the school being in debt, and unable to pay for the instruments. However, he allows Jimmy three weeks to organize the dance to raise money. The event is a success, and the school's debt for the instruments is paid off. Back at home, Jimmy has been reluctant to tell his mother his aspirations to be a dance conductor. Mrs. Connors, who had wanted Jimmy to be a doctor, allows her son to pursue his dream.
Afterwards, Jimmy learns that famed band leader Paul Whiteman (played by himself) is sponsoring a contest in Chicago for the best-performing high school musical group, and Jimmy decides that the band must compete. However, Mr. Judd declines the offer. Needing to raise $200 (equivalent to $3,849in 2024) to pay the traveling expenses, Jimmy decides to put on a show. Meanwhile, Jimmy becomes friends with a new classmate, Barbara Frances Morgan, and decides to attend a local fair with her. He approaches Mary, working at the school library, since they had intended to go together, but she declines.
After the fair, Jimmy and Mary settle on performing Nell from New Rochelle at the Elks Club. The show is another success and raises almost enough money for the band to go to Chicago, though they are still short. After the show, Jimmy goes to Barbara's house and meets her parents. There, he learns that Mr. Morgan has hired Paul Whiteman to perform at Barbara's birthday party.
At the party, Mary notices Willie, a member of the band, is not feeling well. While Whiteman's orchestra is on break, Jimmy, Mary, and the school band perform an impromptu musical number, which impresses Paul that he offers Jimmy a job as an orchestra drummer in New York. Jimmy excitedly tells his mother, who reminds him of his obligation to his friends. Jimmy returns to Paul to decline the offer, which Paul understands. He then advances the fifty dollars to pay the remaining balance for the Chicago trip.
On the day of the trip, Jimmy and Mary learn that Willie has been hospitalized for a fractured arm, which is in immediate need for surgery. The band uses the money so that Jimmy can be flown to Chicago for the operation. Before long, Paul meets with Mr. Morgan, who gives the band a free ride to Chicago aboard his company train. The band competes in Chicago and wins the $500 prize. Jimmy gets the honor of leading all of the bands in a grand finale performance of the title song.
Animation
Also notable is the short "fruit orchestra" stop motion animated scene, in which a series of puppets with various fruits, nuts, and vegetables for heads appear to play orchestral music. The scene was the idea of Vincente Minnelli, animated by George Pal, and directed by Busby Berkeley.
