"The idea is high-pitched sound brings attention and awareness effectively. " I was in a restaurant in a small town outside of Shanghai years ago when an old l

"The idea is high-pitched sound brings attention and awareness effectively. " I was in a restaurant in a small town outside of Shanghai years ago when an old lady came to regale us with her singing accompanied by a one-string stick sort of violin. It was unbearable. Her high pitched voice was weak Waverly and shrill and that one string violin was piercing and offsetting. I mentioned that I would be willing to pay to send the person away and one of my young Chinese dinner companions said "me too"