Dear MMDs and Knut Iversen,  You will find a listing of museums in
the USA (and elsewhere, too!), with some comments, on the web site
http://www.musicamecanica.org/

Although I lack time to update this listing as often as I would
wish (so please always call the museum you consider visiting before
travelling there), it will give you an idea of the main museums and
their collections.

The web site of the MBSI gives also a very good listing, recently
published on the web: http://www.mbsi.org/

Best regards,
Philippe Rouillé (Paris, France)
http://www.musicamecanica.org/