$15 each to get in. Instruments from around the world are arranged by areas of the world. Instruments are displayed in small groups (10 instruments or so in each group) with a video display showing indigenous musicians playing each type of instrument.
There are small plaques that explain a snippet of history. We enjoyed it very much, but it would be nice to have more information, or choice in the type of information you learn, such as an option to see how the instrument is made, or something like that. It didn't seem as if there is enough cultural context for some of the displays. Some hands-on interactivity would have been really enjoyable too.
It is only one year old and you can tell they are growing so I hope for more next time I am in Phoenix. By the way, try the cafe! Gourmet food at reasonable prices, I believe the chefs are culinary students. The food was fantastic.