Jim Casey talks with two country music superstars: Ronnie Dunn—one half of the greatest country duo of all time, Brooks & Dunn—and Jay DeMarcus, one third of the multi-award-winning trio Rascal Flatts. Ronnie discusses his new single, “Damn Drunk,” and album, Tattooed Heart, which Jay produced, as well as his Las Vegas residency with Kix Brooks…