The title song may be the best-remembered part of the film. It was composed by Bronisław Kaper and Walter Jurmann, with lyrics by Gus Kahn. It is sung by Jeanette MacDonald a half-dozen times in the film, and becomes an anthem for the survivors of the earthquake. It has now become a popular sentimental sing-along at public events such as the city's annual earthquake commemoration, as well as one of two official city songs; the other being "I Left My Heart in San Francisco". At San Francisco's historic Castro Theatre, the pre-film organ performance always ends with the song as the organ console is lowered down before the film starts.