On her own and as a member of the Carolina Chocolate Drops, Rhiannon Giddens has explored the depths of folk music, specializing in how old-timey songs and forms still resonate in the modern world. Giddens' music functions as a commentary upon and expansion of the known folk songbook. Her aesthetic made the Carolina Chocolate Drops' two albums for Nonesuch in the early 2010s seem startling and fresh, but not long after the 2012 release of Leaving Eden, she went solo. Tomorrow Is My Turn, her 2015 debut, found Giddens singing 20th century standards and was the first hint of how...