 To answer the title question, eighty-two of every 100 Americans were in 1947, according to the C.E.Hooper survey (the forerunner of the Neilsens)...listening to network radio, that is. Performers, and their radio programs, such as Jack Benny, Bob Hope, Fred Allen,  Fibber McGee and Molly (Jim and Marian Jordan)are shown while on the air, plus network news commentators, quiz programs, soap operas and the musical programs of the day are shown and discussed. When the narrator closed this one with his usual "Time Marches On" pronouncement, most involved here were not looking at television as any threat to Radio just a few short years down the road time was marching on.