Liebling encouraged her to audition for CBS Radio's Major Bowes' Amateur Hour, and on October 26, 1939 at the age of 10, Sills was the winner of that week's program.
Liebling animouna a que se presentase a unha audición para afeccionados da CBS Radio's Major Bowes, e o 26 de outubro de 1939, á idade de 10 anos, Sills foi a gañadora desa semana.