by William RuhlmannIn addition to releasing a string of successful records between 1912 and 1949, Al Jolson achieved pre-eminent stardom on Broadway, hosted several radio series, and became the first important figure of the sound-era of motion pictures. His performing style was brash and extroverted; he billed himself as "the world's greatest entertainer," and he was known for his slogan, "You ain't heard nothin' yet!" He popularized a large number of songs that benefited from his shamelessly sentimental, melodramatic approach, one which, especially when executed in front of live audiences, was considered by those who saw it to justify all his claims to greatness. In middle age, he came to be considered hammy and old-fashioned, but he mounted a major comeback late in life. A more serious impediment to his long-term legacy, however, is that he was the foremost blackface entertainer of his day, and his reputation has suffered as the racist impl...