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The first sound to be recorded by a machine wasn't intended ever to be heard again—but modern researchers found a way around that problem.
Unveiling History: Thomas Edison, Leon Scott de Martinville, and the Earliest Recorded Voices - Video Summarizer - Glarity
Poetry Sound Library Blog - POETRY SOUND LIBRARY
The Invention Of The Phonograph: From Early Recordings To Modern Time - ProSoundWeb
Who is the oldest person (in terms of the year of birth) to have been voice recorded? - Quora
The Phonautograph. Sound recording before Edison, by Russell Potter, Media History
Thomas Edison Did NOT Record The First Sound!
Scott Edison's Instagram, Twitter & Facebook on IDCrawl
Edison vs. Scott Lapham's Quarterly
Early sound recording hi-res stock photography and images - Alamy