PLAYA DEL CARMEN, Mexico -- On a hot and languid afternoon in this tourist town on the Caribbean Sea, a Mexican band dressed in Wrangler jeans and black cowboy hats performed poolside at Hotel Xcaret Arte, an all-inclusive resort. While guests sipped frosty drinks, the quintet sang about a guy who fell for a girl who crushed his heart. Booze, that sly temptress, showed up to soothe his pain.