The Grand Ole Opry tallied its 4,937th consecutive Saturday night broadcast on Aug. 15 with a showcase featuring a pair of country music’s biggest stars: Luke Bryan and Darius Rucker. Darius performed a number of his fan-favorite tunes, as well as his brand-new single, “Beers and Sunshine.” Penned by Darius, Ross Copperman, J.T. Harding and…