San Francisco ? At first listen, the grainy high-pitched warble doesn’t sound like much, but scientists say the French recording from 1860 is the oldest known recorded human voice.

The 10-second clip of a woman singing “Au Clair de la Lune,” taken from a so-called phonautogram, was recently discovered by audio historian David Giovannoni. The recording predates Thomas Edison’s “Mary had a little lamb” – previously credited as the oldest recorded voice – by 17 years.

The tune was captured using a phonautograph, a device created by Parisian inventor Edouard-Leon Scott de Martinville that created visual recordings of sound waves.

Using a needle that moved in response to sound, the phonautograph etched sound waves into paper coated with soot from an oil lamp.

Giovannoni and his research partner, Patrick Feaster, began looking for phonautograms last year and in December discovered two of Scott’s – from 1857 and 1859 – in France’s patent office. Using high-resolution optical scanning equipment, Giovannoni collected images of the phonautograms that he brought back to the United States.

“What Scott was trying to do in 1861 was establish that he was the first to arrive at this idea,” Giovannoni said. “He was depositing with the French Academy examples of his work.”