was an important event in the history of American musical theatre. It "was a radical departure in musical storytelling, marrying spectacle with seriousness", compared with the trivial and unrealistic operettas, light musical comedies and "Follies"-type musical revues that defined Broadway in the 1890s and early 20th century. According to The Complete Book of Light Opera:

Here we come to a completely new genre - the musical play as distinguished from musical comedy. Now ... the play was the thing, and everything else was subservient to that play. Now ... came complete integration of song, humor and production numbers into a single and inextricable artistic entity.