What talents made performers like Bert Williams and Fanny Brice popular with mainstream audiences

Performers like Bert Williams and Fanny Brice is more popular as a comedian or as an entertainer in the mainstream audience. In addition, Fanny Brice has the comic versatility who uses Yiddish accent, which make the audience laugh at her. Meanwhile, Bert Williams is a great performer who uses exaggerated character by using outrageous rooster costume and pantomime poker game.

They had the talent of singing.