We all know about the long--and so far, vain--search for an extant sound
recording of Twain's voice. There may yet be hope, given the news that a
long-lost wax cylinder of the voice of Otto von Bismarck has been found
among a trove of recordings made by Thomas Edison. You can see an
article on this news item at
http://www.boston.com/news/nation/articles/2012/02/05/nj_museum_finds_re
cording_of_otto_von_bismarck/. It's not Twain, but it's a reminder that
there might still be a recording out there somewhere.

Jim Edstrom

P.S. You can hear part of the Bismarck recording at
http://www.youtube.com/watch?v=Z2Qnh8AIjbo&feature=related .