I used to have a bunch of cassette tapes of old radio programs -- The Lone Ranger, Abbott & Costello, The Goon Show, Bob & Ray, The Shadow, stories like War of the Worlds and Leiningen Versus the Ants. They're probably still around somewhere, if the magnetic tape hasn't completely deteriorated in the last oh, 25 years. Enter the digital era -- there's a huge trove of old radio shows over at Archive.org. Start by downloading The Shadow. You can't go wrong with Orson.