I recently visited this museum in downtown Minneapolis.  It is in the
basement so I don't think they get much traffic.  You won't find any of
what you might think of as mechanical music instruments.

You will find a room full of fascinating old pianos.  Some are
reproductions of the very first pianos ever made and others have been
played by various artists such as Liszt.  One interesting piece was a
dual keyboard harpsichord.  In the room next door was a display of
interesting musical instruments from Africa, I believe.

The Club is very worthwhile to visit if you are in the area.  I believe
they also have special concerts from time to time.  They also bring in
pianists to play the antique pianos although I gather that keeping them
in tune is quite a challenge.

Gerry Bay