Awesome - I have an album of Glass Harmonica music and I knew a bit about its weird history but somehow I'd actually never seen it action before. ***** A++
The "It makes you mad!" thing actually stemmed out of a dispute after Ben Franklin sat on Louis XVI's council deposition against Anton Mesmer, of Mesmerism.
Ben Franklin took a dim view of Mesmerism, and in response, Mesmer started the madness rumors.