The wide-ranging and thought-provoking collection of specially-commissioned essays in this anthology conveys a uniquely comprehensive overview of the many ways in which music functions in film soundtracks. Flinn's essay, “Music in Screen Musicals,” provides a brief overview of film-musical scholarship and explores its impact on conceptions of the genre and our understandings of its music. Challenging the classical paradigm of 'what defines a musical,' Flinn, in discussing the roles played by their songs and their music, argues how diversified musical production actually is, and reflects on the complexity of categorizing this rapidly evolving genre.