Answer: aljolson

AnswerCrossword Clue
ALJOLSON"The Jazz Singer" singer
ALJOLSONSubject of a 2006 biography with the subtitle "Sittin' on Top of the World"
ALJOLSON"The Jazz Singer" star
ALJOLSONEntertainer who coined the phrase "You ain't heard nothing yet"
ALJOLSON"You ain't seen nothin' yet" speaker
ALJOLSONSinger-actor whose story is told in a 1946 film
ALJOLSON"Swanee" singer