Binaural or Bust - The evolution of stereo
Bob Furmanek has assembled a great chronology about the evolution of stereo or Binaural as it was more commonly referred to in the early days. It is also has lots of information about the beginnings of the pre-recorded tapes industry. Although, nowhere near as in depth, this site addresses the same subject http://userwww.sfsu.edu/hl/s.html