We live in a world where the terms “artist” and “genius” have been rendered meaningless through overuse. To use either in describing Thorn, though, is not overreach. Pick up any of his dozen or so CDs. The evidence is plain to see. Just listen. It’s a kind of genius, and it’s there plain to see, in his music, his art and through his performances, which not only showcase his chops as a singer-songwriter, but as a pitch-perfect improv comic.