From 1936–39, she was a featured cast member in 39 episodes of Al Jolson's weekly CBS radio show, "The Lifebuoy Program", also called "Cafe Trocadero." In addition to comedy, Martha sang both solos and duets with Jolson. Over the next quarter century, she would appear with many of the leading comics of her day, including Joe E. Brown, Bob Hope, W. C. Fields, Abbott and Costello (in "Keep 'Em Flying"), Charlie Chaplin (in "Monsieur Verdoux"), and Jimmy Durante. She joined the USO in 1942, soon after the US entered World War II.