BLACK & WHITEWhen "Polk Salad Annie" blared from transistor radio speakers in the summer of 1969, the first thought was of Creedence Clearwater Revival, for Tony Joe White's swamp rock bore more than a passing resemblance to the sound John Fogerty whipped up on Bayou Country and Green River. But White was the real thing he really was from the bayou country of Louisiana, while Fogerty's bayou country was conjured up in Berkeley, CA. Plus, White had a mellow