 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.The development of commercial sound cinema had proceeded in fits and starts before "The Jazz Singer", and the film's success did not change things overnight.