Mixing of Media

It can lead to some ridiculous combinations. Yesterday, a woman gave me a DVD of a radio show from the 1950s. Curious, I put it on. It seemed logical they had installed a camera in the radio station to film the cast, as they read scripts, and the sound effects person banged a few things and shook a few others. Instead, a strip with information on it appeared on the screeen. The program commenced playing, exactly the way it would on the radio; no pictures. !!!!