Rida Johnson Young (ca. 1869–1926) was one of the most prolific female playwrights of her time, as well as a lyricist and librettist in the musical theater. She wrote more than thirty full-length plays, operettas, and musical comedies, five hundred songs, and four novels. Despite her extensive output, no significant study of her work has been produced. This book examines her musical theater works with in-depth analyses of her librettos and lyrics, as well as her working relationships with other writers, performers, and producers, particularly Lee and J. J. Shubert. Using archival materials such as original typescripts, correspondence, and reviews, the book contextualizes Young’s work within the milieu of the early-twentieth-century professional theater and provides a window into the standard practices of writing and production of the era. The works examined are Naughty Marietta, Lady Luxury, The Red Petticoat, When Love Is Young, His Little Widows, Her Soldier Boy, Maytime, Sometime, Little Simplicity, and The Dream Girl.