After taking his Dive Bar Tour to Chicago (July 15), Bakersfield (Aug. 15) and New Braunfels (Sept. 23), Garth Brooks announced the fourth stop on his seven-date tour: The Barn in Sanford, Fla., on Oct. 16. Garth actually sings about The Barn in his 1995 song, “The Old Stuff,” which he co-penned with Bryan Kennedy…