Seth Warner will be joined by upright bassist, Duane Edwards, guitarist, Mike Derosier and drummer Marty Joyce tonight, Friday, Aug. 11, at Guthries, 115 Middle St., from 8 to 10 p.m. An evening of acoustic blues, folk, standards and the best of the singer-songwriter tradition including an entire set of music by the late, great Texas songwriter, Townes Van Zandt is on tap.