IS REX REED JIMMY WALKER the SWAMP COUNTRY SINGER? quiz fun

On this fun To Tell the Truth segment, 3 contestants all claim to be JIMMY WALKER, who spends his days tending to the Okefenokee Swamp, and at night performs with the Swampers. On the SWAMPERS label, Walker recorded "Swamp Country." Can erudite Rex Reed (at the time merely a NY Times freelancer) fool anyone on the panel? Yes you get to hear "Swamp Country" the song that was also used in the film of the same name (but not performed by Jimmy in the movie).