Which film is recognized as a landmark in the development of the musical genre?

The recognition of "The Jazz Singer" as a landmark in the development of the musical genre stems from its significance as the first synchronized sound feature film, marking a pivotal transition in cinema history. Released in 1927, it introduced both talking and singing performances that captivated audiences and showcased the potential of sound in film. This innovation set the stage for musicals to flourish, as filmmakers began to explore how sound could enhance storytelling and emotional expression.

While "West Side Story," "The Sound of Music," and "Singin' in the Rain" are all iconic musical films known for their rich storytelling and memorable scores, they emerged in a time when the musical genre was already established and thriving. They built upon the groundwork laid by earlier films like "The Jazz Singer," which revolutionized the experience of watching films by integrating sound and music in a seamless fashion. This foundational shift allowed musicals to evolve into widely popular and critically acclaimed productions in the decades that followed.