I have been here twice so far and still have not discovered everything that is in there. The interactive tour plus the room where you can play all the instruments are just a small part of the cool stuff there. The staff is really nice and knowledgeable about the instruments and history.
I finally went to the cafe that they have there and had a Butter Scotch rootbeer. I didn't even know that existed! The maker is called Dang! That's Good! and I agree.
Warning though, if you plan to go, go early because otherwise you won't see everything. It's pretty much a day trip.