The MIM is the most remarkable, and entertaining museum on musical history and geography I have ever experienced. We spent 3+ hours there, which wasn't enough time to study all the displays, so I recommend 4 hours to take it all in. The museum is 8 years old, neat , clean and modern, with more than 6800 instruments from all over the world, with a self guided audio tour....and the $20 entrance fee is well worth it. A "must do" event if visiting Arizona.