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I noticed that there is another documentary on BBC 4 about the history of light entertainment.
What is the difference between "variety" and "light entertainment"? Is one (Variety) a live experience and the other (light entertainment) a creation of the media (radio)?
Variety refers to the specific idea of a full theatrical bill of varied acts. Light Entertainment is a sub-category of entertainment that can refer to individual acts and/or programmes.
To be a bit more specific: in the 1960s the BBC TV Light Entertainment Department was divided up between a Head of Variety (Bill Cotton) and a Head of Comedy (Frank Muir/Michael Mills). So Cotton commissioned things like his Dad's show, which mixed music with solo comedy acts with dance acts and novelty acts all on the same bill, while Muir or Mills commissioned sitcoms, sketch shows or comedy plays.