With deep roots in folk, rock, and pop, Maria Muldaur has been touring worldwide for more than 50 years. These days she’s digging into the catalogue of New Orleans jazz and blues singer Blue Lu Barker, whose 1930s and ‘40s hits include “Don’t You Feel My Leg” and “Look What Baby’s Got for You.” There is no better pairing than a sultry summer night and some down and dirty New Orleans rhythm and blues.