By Denny Dyroff, Staff Writer, The Times JJ Grey JJ Grey doesn’t hollowly boast about “draining the swamp” but rather brings the music of the swamp to listeners around the world. Based in Jacksonville, Florida, Grey and his band JJ Grey & Mofro are known for playing lively southern swamp rock. On October 21, JJ Grey & Mofro will visit the area for a show at Union Transfer (1026 Spring...