Foghorn Stringband trade in what they call “ass-kickin’ redneck stringband music.” That’s a colorful way of saying the Portland, Oregon-based quartet specialize in a version of old time music that is as steeped in roots tradition as it is devilishly entertaining. Foghorn Stringband play a run of dates in Vermont this week: Thursday, March 26, at a square dance at the American Legion in Montpelier; Saturday, March 28, at the Skinny Pancake in Burlington; and Sunday, March 29, at the Skinny Pancake in Montpelier.