(HUDSON, N.Y.) – Singer-songwriter Loudon Wainwright III, a one-time “new Dylan” who has over time become the somewhat unlikely patriarch of a folk music family dynasty, performs his uniquely acerbic songs at Club Helsinki Hudson on Thursday, August 2, 2012, at 9 p.m. Wainwright’s career spans more than 40 years and 23 albums. He sings…