Sofía Cancino de Cuevas first quartet for strings, catalogued as Op. 1. In 1940, she received an honorable mention for her symphonic poem "El gallo en Pátzcuaro" for orchestra and male choir, in a contest organized by UNAM. In 1941 she directed the presentation of Mozart's "Don Giovanni" at the Arbeu theater, with the participation of singers (baritone), Carlos Mejía (tenor), and Margarita Cueto (soprano), among others. This made her Mexico's first female conductor. In 1944 she founded the Opera School, with which she conducted "La serva padrona" by Giovanni Battista Pergolesi, "Bastien und Bastienne" by Wolfgang Amadeus Mozart, and "Il matrimonio segreto" by
Down in the Valley (opera) Down in the Valley (opera) Down in the Valley is a folk-opera in one act by composer Kurt Weill and librettist Arnold Sundgaard, initially composed and conceived for the radio in 1945 then rewritten and produced in 1948. It uses famous American tunes to carry the story (including "Down in the Valley", "The Lonesome Dove", and "Hop Up, My Ladies") and connected by original choral music. This short opera, originally running only about 20 minutes, was conceived as the first of a series of radio operas by Olin Downes, the music critic of "The New York Times", and Charles McArthur,