Written and produced by Ludovic Kennedy.
Take seventy basses, forty tenors, seventy altos, and a hundred sopranos, put them together every Monday evening, and you get the magnificent Bach Choir.
In a pub in North London a very different group of singers get together every Sunday to make their kind of music - The Hampstead Folk Club.
Ludovic Kennedy went to meet the singers and to listen to some of their songs.
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