Moanin' Low is a popular torch song. The music was written by Ralph Rainger; the lyrics by Howard Dietz. The song was published in 1929 and was introduced that same year in the musical revue The Little Show by Libby Holman becoming a hit and Holman's signature song. Since its publication, the song has become a popular jazz standard. Billie Holiday recorded her version of the song in 1937. In the movie Key Largo, Claire Trevor gave a memorable rendition of the song in a role that won her the 1948 Academy Award for Best Supporting Actress.