Hello all,  I have been working in a project at the Stockholm Music
Museum with the main purpose to make the collection more public.
The work has included the mechanical [self-playing] instruments in
the collection, and even if there still is a lot of work to be done,
most of the instruments can now be seen (and some of them heard) at
the museum's homepage at Stockholm Music Museum:

  http://stockholm.music.museum/samlingar/index.php?l=en
or
  http://www.musikmuseet.se/samlingar/index.php?l=en

In the panel at the left of the main web page you must click on
"Collections" then more choices appear and you click on "Instrument".
A new page appears and you can select category "Mechanical Instruments";
you finally choose among barrel organs, music boxes, etc.

If you have the time to have a look, I would appreciate any response
(especially if you find any errors that should be corrected).

Best wishes,
Dan Johansson
Stockholm