Mabel Daniels (1877–1971): An American Composer in Transition assesses Daniels within the context of American music of the first half of the twentieth century. Daniels wrote fresh sounding works that were performed by renowned orchestras and ensembles during her lifetime but her works have only recently begun to be performed again. The book explains why works by Daniels and other women composers fell out of favor and argues for their performance today. This study of Daniels’s life and works evinces transition in women’s roles in composition, the professionalization of women composers, and the role that Daniels played in the institutionalization of American art music. Daniels’s dual role as a patron-composer is unique and expressive of her transitional status.