Between, WABC and returning to Greater Media as group PD, Julian Breen was PD at KYA in the San Francisco market. He once told me the story of how he "invented" the Magic format based on the jukebox in an Embarcadero bar where he would wait for the Sausilito ferry on his way home from work.
He said the bar offered perfect demos with "successful professionals" of the right age, income, and psycho-graphic characteristics. While sipping a beer and waiting for the next boat, he would observe the patrons choice of music on the jukebox. Their choices were the basis for a radio radio format that was a big success in several major markets, and Central Jersey. I'll bet they never had a clue.
Julian passed away in 2005 at age 63. He lived in Pennington, NJ.