Cantor's initial radio appearance was with
Rudy Vallee's The Fleischmann's Yeast Hour on
February 5, 1931, and it led to a four-week tryout with NBC's
The Chase and Sanborn Hour. Replacing
Maurice Chevalier, who was returning to Paris, Cantor joined
The Chase and Sanborn Hour on
September 13, 1931. This hour-long Sunday evening variety series teamed Cantor with announcer Jimmy Wallington and violinist Dave Rubinoff. The show established Cantor as a leading comedian, and his scriptwriter,
David Freedman, as “the Captain of Comedy.” Soon, Cantor became the world's highest-paid radio star. His shows began with a crowd chanting, "We want Can-tor, We want Can-tor," a phrase said to have originated when a vaudeville audience chanted to chase off an opening act on the bill before Cantor. Cantor's theme song was the 1903 pop tune "Ida, Sweet as Apple Cider," dedicated to his wife.
Indicative of his effect on the mass audience, he agreed in November 1934 to introduce a new song by the songwriters
J. Fred Coots and
Haven Gillespie that other well-known artists had rejected as being "silly" and "childish." The song, "
Santa Claus Is Coming to Town", immediately had orders for 100,000 copies of sheet music the next day. It sold 400,000 copies by Christmas of that year.
In the 1940s his
NBC national radio show was
Time to Smile. In addition to film and radio, Cantor recorded for
Hit of the Week Records, then again for Columbia, for
Banner and
Decca and various small labels.
He was a founder of the
March of Dimes, and did much to publicize the battle against
polio. Cantor also served as first president of the
Screen Actors Guild. His heavy political involvement began early in his career, including his quick rush to strike with Actors Equity in 1919, against the advice of father figure and producer, Florenz Ziegfeld.
Cantor's career declined somewhat in the late 1930s due to his public denunciations of
Adolf Hitler and
Fascism. Wishing to distance themselves from any political controversy, many sponsors dropped Cantor's shows. However, it soon bounced back with the United States' entry into
World War II.