Sound Recording Predates Edison Phonograph, National Public Radio. URL consultato il 5 aprile 2008.
«He invented a device called the phonautograph, and, on 9 April 1860, recorded someone singing the words, 'Au clair de la lune, Pierrot repondit .' But he never had any intention of playing it back. He just wanted to study the pattern the sound waves made on a sheet of paper blackened by the smoke of an oil lamp.»
