The piano piece that Rhoda plays and sings and is heard as a theme throughout the film is the traditional French children's song "Au Clair de la Lune".
The Bad Seed
Air Force Colonel Kenneth Penmark and his wife, Christine, dote on their daughter, Rhoda -- as does their lonely landlady, Monica Breedlove. But self-centered Rhoda has a secret tendency for selfishness and loves to accumulate gifts, whether given or stolen, in her room. Christine keeps her knowledge of her daughter's darker side to herself, but when a schoolmate of Rhoda's dies mysteriously, her self-deception unravels.
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