Episode 231: Sam Bush was the first guest on The String way back in September of 2016, because he's a hero of mine and an exemplar of the Americana ideal, traditional American music with a contemporary outlook. He returns to talk about one of his heroes, the late great John Hartford. They were friends, picking buddies and sometime tour mates. And while there are many sides to Hartford, Sam wanted to celebrate his remarkable songwriting, which he does on the new album Radio John.