The earliest known recorded song was made possible through the phonoautograph, which was a recording device invented in 1857 by Edouard-Leon Scott de Martinville.  A recording of a French folksong, “Au Clair de la Lune” has been dated to April 9, 1860, making it the earliest recognizable recording of a human voice.  Here it is:

http://www.firstsounds.org/sounds/1860-Scott-Au-Clair-de-la-Lune.mp3

Wow.  That sounds really good.  I’m going to turn up the bass in the car and bump that jam!!!