The plot concerns con man Harold Hill, who poses as a boys' band organizer and leader and sells band instruments and uniforms to naïve Midwestern townsfolk, promising to train the members of the new band. Harold is no musician, however, and plans to skip town without giving any music lessons. Prim librarian and piano teacher Marian sees through him, but when Harold helps her younger brother overcome his lisp and social awkwardness, Marian begins to fall in love with him. He risks being caught to win her heart.
In 1957, the show became a hit on Broadway, winning five Tony Awards, including Best Musical, and running for 1,375 performances.