The Ballad of Baby Doe is an opera by the American composer Douglas Moore that uses an English-language libretto by John Latouche. It is Moore's most famous opera and one of the few American operas to be in the standard repertory. Especially famous are the title heroine's five arias: "Letter Aria," "Willow Song," "I Knew it Was Wrong", "Gold is a Fine Thing", and "Always Through the Changing." Horace Tabor's "Warm as the Autumn Light" is also frequently heard. Distinguished sopranos who have portrayed Baby Doe include Beverly Sills (Moore's favorite interpreter of the role), Karan Armstrong, Faith Esham, and Elizabeth Futral.