"Extraordinary claims require extraordinary evidence."No. Extraordinary claims made with no evidence (e.g., properly controlled listening tests) are absolutely worthless (worse than worthless, really, since they will hook the gullible) and can be dismissed out of hand. Come back with evidence, and that's a different story. This, of course, never seems to happen, just more foot-stamping, handwaving, and the usual tired assortment of logical fallacies.
"What can be asserted without evidence can also be dismissed without evidence."