Hello Mike and MMD,  When starting in Amsterdam it's a good thing to
start with the Pianola Museum.  Their address is

  Westerstraat 106
  1015 MN Amsterdam
  tel.: (0031)(0)20-6279624
  http://www.pianola.nl/ 

The bad news is they are only open on Sundays.  The good news: the
other days are open on appointment.  Just give them a call and most
likely somebody is able to give you a tour.

The Utrecht museum is open every day except for Mondays.  Utrecht is
about 15 to 20 minutes by train from Amsterdam, so it's very doable
if you have more than two hours spare time. ;) The Utrecht address is

  Steenweg 6
  3511 JP Utrecht
  Tel. (0031)(0)30 231 27 89
  Fax (0031)(0)30 232 22 85
  http://www.museumspeelklok.nl/ 
  email: Post@museumspeelklok.nl

Have a good time in Europe!

Regards from the Netherlands,
Niels Berkers