Answer: aljolson

AnswerCrossword Clue
ALJOLSON

"The Jazz Singer" singer

ALJOLSON

Subject of a 2006 biography with the subtitle "Sittin' on Top of the World"

ALJOLSON

"The Jazz Singer" star

ALJOLSON
Entertainer 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