09/04/1860 Édouard-Léon Scott de Martinville makes the oldest known recording of an audible human voice
First sound ever recorded 1860 - 1885 - 1900
Humanity's First Recording of Its Own Voice - Act 7 - Finding Édouard-Léon
The recording, of part of the French folk song Au clair de la lune, was initially played at a speed that produced what seemed to be a 10-second recording of the voice of a woman or child singing at an ordinary musical tempo. The researchers later found that it was actually a 20-second recording of a man, probably Scott himself, singing the song very slowly.