In the 1920s, filmmakers began experimenting with sound effects and music in films. With about 15 minutes of dialogue and songs, The Jazz Singer was the first feature-length film to have synchronized dialogue. Based on the earlier stage play, the film was a landmark in the history of motion pictures, and its release heralded the commercial ascendance of “talkies” and the decline of the silent film era. The first all-talking picture was released a year later. What was it? Discuss