Measurement proves nothing. Let's have John measure a group of tenors singing a line of music. Human vocal cords are made of the exact same material. If all the tenors sing all the right notes, the sound will "measure" the same on John's equipment. If John is correct, then all tenors must sound the same, and any difference we heard between the sounds created by Pavarotti, Bocelli, Domingo and your local church cantor is just an illusion. I can tell a difference, so I guess I better go get some Prozac.
