Excellent display of music from around the world. In my opinion, this is the best museum that I've been to in Arizona. If you go plan to spend a day. Musical instruments are represented from every country in the world. Through the use of headsets you can listen to close-proximity wifi explaining many of the instruments OR giving examples of them in use. Even if you aren't that into music (I am not) you can still be amazed by the fine artistry and ingenuity of people from just about anywhere as they seek to make a pleasing noise.
Best museum, kind of out-of-place, in Phoenix.