The first audio recording?
Believe it or not? It's logical that something inspired Edison to come up with his (relatively advanced) cylindrical <edit> phonograph...... and it's in Wiki so it must be true....
http://en.wikipedia.org/wiki/History_of_sound_recording
and
http://en.wikipedia.org/wiki/Phonautograph
http://en.wikipedia.org/wiki/History_of_sound_recording
and
http://en.wikipedia.org/wiki/Phonautograph
