The Music Man is a 1962 musical film starring Robert Preston (Harold Hill) and Shirley Jones (Marian Paroo). The film is based on the 1957 Broadway musical of the same name by Meredith Willson.
"Confidence man Harold Hill arrives at staid River City intending to cheat the community with his standard scam of offering to equip and train a boy's marching band, then skip town with the money since he has no music skill anyway. Things go awry when he falls for a librarian he tries to divert from exposing him while he inadvertently enriches the town with a love of music." (from IMDb)
Till There Was You