When floodwaters rose in Nashville, musicians were among the hardest hit—Kenny Chesney among them. His house may be condemned, but he’ll be in Baton Rouge on Memorial Day weekend for the inaugural Bayou Country Superfest in Tiger Stadium. On Saturday, May 28, Taylor Swift will headline a day that features Keith Urban, Kellie Pickler, David Nail and Gloriana; on Sunday, Chesney will close the festival and a day that includes Brooks & Dunn...