Josh Goforth, a storyteller and acoustic musician in his 40s, stood at the microphone beneath the Courthouse Tent in Jonesborough, Tennessee. He had decided to start his set with a song, and since the tent was just yards from the railroad tracks, he chose a bluegrass standard called “I’m Bound to Ride.” It follows a railroad worker as he travels from town to town, pining intermittently for the girl he left back home.