Behind the Mike was a behind-the-scenes view of radio personalities, personnel and operations. This version of the program aired from 15 Sep 1940 until 19 Apr 1942. Of the possible 83 episodes, it appears only 32 are currently known. The program was developed as a way for radio listeners to learn more of their favorite radio personalities, programs, and behind-the-scenes people who contributed to the production of radio programs. The host of the show was Graham McNamee. (OTRR)
Back of the Mike - How Radio Sound Effects are Made (1930's)
Not related to Behind the Mike, but very interesting to watch.
Begins with the visualization of what the boy is thinking listening to the radio, you can see what is meant by "Theater of the Mind", but when you get to the part in the radio studio, get ready to be entertained watching how the sounds were made.
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