JOHN FOGERTY is many things, none of them ordinary. Besides his obvious musical ability, he is unique even among musicians. A loner, self-reliant and firmly committed to his beliefs. An intelligent, articulate, mature individual, with an understanding of music and society and his own position in relation to them. A clean-living, self-respecting man who has consistently sidestepped the blinding pitfalls of super-stardom. A maverick. And, in many ways, an enigma.