Hanna Barczyk for NPR
Close Listening: How Sound Reveals The Invisible
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Remembering NPR's Bill Deputy, A 'Guardian Of Sound'
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Actor, playwright and composer Noel Coward rehearses for a show in 1951. A rare recording of Coward introducing his play Peace in Our Time is just one of the millions of sounds and recordings the British Library is looking to preserve. Jimmy Sime/Getty Images hide caption

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From Wax Cylinders To Records, Saving The Sounds Of History
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Stefan Kudelski, Who Made Sound Recording Portable, Dies
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