Before revision: An 1860 phonautogram of Au Clair de la Lune , a French folk song, was played back as sound for the first time in 2008 by scanning it and using software to convert the undulating line, which graphically encoded the sound, into a corresponding digital audio file.
After revision: ""An 1860 phonautogram of Au Clair de la Lune , a French folk song, was played back as sound for the first time in 2008 by scanning it and using software to convert the undulating line, which graphically encoded the sound, into a corresponding digital audio file.