Being a former band nerd in high school, so much nostalgia kicked in upon entering the museum. I saw all the instruments I was familiar with in high school, and many others that I wasn't familiar with (and learned much about). 

They supply you with headphones and a wireless receiver that plays the audio/video of the different sections you walk into. Each plays a sample of what the instruments sound like and some give detailed history on the instrument. Very enlightening experience.

Best Part IMO: They have a room where you get to test random instruments to your heart's content! I really wanted to go ham on the gong but there was a sign that said something along the lines of "do not hit the gong repeatedly". I was disappoint... but otherwise many other instruments in there kept me occupied for awhile (xylophone, conga, harp, etc)

It's not an arm and a leg to get inside, and this place has something for everybody. You're sure to spend a few hours enjoying yourself here.

If you're going to do anything in Phoenix, this is one of the spots you should definitely check out.