aljolson Singer-actor whose story is told in a 1946 film Russian-born American singer and film star, d. 1950 Entertainer who popularized the phrase "You ain't heard nothing yet" "You ain't seen nothin' yet" speaker 'Swanee' singer Swanee singer, d. 1950 Talking picture star "The Jazz Singer" singer Subject of a 2006 biography with the subtitle "Sittin' on Top of the World"