Despite a long career, Loudon Wainwright III remains unknown to most. If he is remembered at all, it’s probably for his novelty hit “Dead Skunk in the Middle of the Road” or perhaps because he performed an occasional song on TV’s M*A*S*H. His son Rufus’ recent debut got far more press than his father’s latest, Little Ship. Rufus has been the subject of several of Loudon’s songs, beginning with the amusing ditty about breastfeeding “Rufus Is a Tit Man” through the heartfelt “Your Mother and I,” in which the father explains divorce to his young son. The elder Wainwright’s fans appreciate the folk singer for his lyrical eclecticism, ranging from light, amusing throwaways to moving personal odes. “Motel Blues” is one of my favorites among the latter. Though the specifics detail life on the road for one rock ‘n’ roller, it will resonate with anyone who has ever known loneliness. At 8 p.m. at the Barns of Wolf Trap, 1624 Trap Road, Vienna. $18. (703) 938-2404. (Mark W. Sullivan)