Then, on October 6, 1927, Warner Bros.' "The Jazz Singer" premiered. It was a smash box office success for the mid-level studio, earning a total of $2.625 million in the United States and abroad, almost a million dollars more than the previous record for a Warners film. Produced with the Vitaphone system, most of the film does not contain live-recorded audio, relying, like "Sunrise" and "Don Juan", on a score and effects. When the movie's star, Al Jolson, sings, however, the film shifts to sound recorded on the set, including both his musical performances and two scenes with ad-libbed speech—one of Jolson's character, Jakie Rabinowitz (Jack Robin), addressing a cabaret audience; the other an exchange between him and his mother. The "natural" sounds of the settings were also audible. Though the success of "The Jazz Singer" was due largely to Jolson, already established as one of U.S. biggest music stars, and its limited use of synchronized sound hardly qualified it as an innovative sound film (let alone the "first"), the movie's profits were proof enough to the industry that the technology was worth investing in.