There’s an urgency to the songs on Freedom Highway, Rhiannon Giddens’ blazing new solo album, that will make you want to take to the streets and march. Whether you follow that urge or not, take it as a sign that Giddens is on a journey from folk singer to folk firebrand. As a member of the Carolina Chocolate Drops, Giddens created lovely, grinning old-time music; her solo debut, Tomorrow…
