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In the early days of radio music was live on the air with both radio networks and stations keeping a staff orchestra. Playing of phonograph records on the radio was supressed until some stations wanted to replace their musicians with discs.
After a fierce legal battle the musician’s union enforced a rule that radio stations must hire turntable operators who must be members of the musician’s union.
It was independent FM stations that began running discs without turntable operators and the entire scheme ended.
The electrician’s union for years required station audio board operators to be members of the brotherhood of electrical workers. This also ended during the rise of FM.
My knowledge of this history is sketchy, but generally on target.