Wyatt’s albums over the past 30 years or so tend to be modest-sounding affairs highlighted by his reedy voice and compositions in which he blends his gift for jazzy melody with a ferocious intelligence and a gimlet-sharp political focus. When the promised clog dancing at the Unthanks’ gig goes down, it’s to Wyatt’s deceptively jaunty “Dondestan,” the chorus of which goes, “Palestine’s a country/ Or, at least used to be.” The performers clearly feel the weight of Wyatt’s lyrical concerns, and the restiveness heard early in this selection of performances disappears. Their performance of “Free Will and Testament” makes the most of its ’50s slow-dance melody and the verses’ weary concern with bedsit ontology. The sisters likewise lend urgency and grace to “Out of the Blue,” Wyatt and his wife Alfred Benge’s channeling of a victim of random aerial bombing such as might be going on by U.S. planes in Afghanistan as you read this. Wyatt’s pen can be as biting when it comes to domestic relations (“Sea Song”) as about international relations (the anti-colonialist “Lisp Service”—“Plundering, murdering/ Raiding coast to coast/ Good old days of gore”), but either way, such uncompromising, engaged songwriting is sorely missing in these unengaged times, and god save a pair of singing sisters from the North of England out to spread it around.