Vera Meyer plays the Glass Armonica (aka Harmonica) in Harvard Square, Boston, July, 2005. The instrument, an invention of Benjamin Franklin, was quickly banned after its inception. It was said to provoke insanity. The unique harmonics have also been said to import theraputic powers. It is also known as the "Glass Armonica".
VERA MEYER:
http://www.myspace.com/verameyer
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Perhaps a Diminished Scale? Or a Tritone. (Diabolus in Musica) For which you could be Burned by the Inquisition. But it wasn't thought to Cause Insanity, but rather, it was "the Devil in Music". Sorry. I'm in an Annoying Mood...