It was not the pipes that drove Humphrey back into SF Bay. It was the single short recording of a feeding humpback – recorded in Alaska by two doctoral students at the U. of Hawaii – and then transformed into a series separate and different recordings that lured the whale back into the Bay on November 3rd & 4th, 1985. The specific protocol used that day was derived from a combination of work done by Scott Baker, Joe Mobley (in Lou Herman's program), Diana Reiss, and myself.