This is the 1938 radio broadcast of Orson Welles "War of the Worlds". This broadcast sent a lot of people who didn't hear the beginning of the show into panic and while it caused a public outcry against CBS and Orson Welles, it made Welles a star. The recording is rather scratchy, but it IS almost 72 years old!

http://www.archive.org/details/OrsonWellesMrBruns