Loudon Wainwright III new show “Surviving Twin” is a retrospective of his life. It is monolog driven featuring his songs. It is billed as “a posthumous collaboration” between Wainwright and his father, Loudon Wainwright Jr., the Life magazine columnist. Loudon III’s songs pair up with his father’s letters from the 1940s, before Loudon III was born. Wainwright is energetic, humorous and passionate on stage drawing the audience in to his intimate outlook of the world.