Wow.
There are a lot of instruments here. A LOT. Almost to the point where its overwhelming and you don't care to see another foreign instrument anymore and just want to go to the room where you can touch/play some of them. That's what happened to me anyways.
Upstairs is their collection of instruments from around world - divided up by continent, and then further divided by country, and then some further divided by time period or region. This is the part where I was overwhelmed. There was SO much to look at and SO much to listen to. We started off listening to and looking at every country, then we just looked, and then we just walked around to the countries we were interested in.
There is a room on the bottom floor where you can play some of the instruments - including a giant gong! yesss!!