Nothing Is Unbelievable Anymore.
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For more on marking an answer as the "Best Answer", please visit our FAQ.It goes back further than the BBC. The Old Greys worked as doormen, janitors etc at record companies in the USA (New York, I think). There were teams of songwriters who churned out song after song. When they played new songs to the Old Greys, the "test" was to see if the song was catchy enough for the Old Greys to remember it, and then whistle it. If it was, it had passed the test and would get recorded. This was in 1920s and 1930s, just a vinyl records were taking off.