Dorris Henderson was an anomalous part of the mid-'60s British folk scene: a young black American woman singing traditional songs with accompaniment from one of the best young British folk guitarists, John Renbourn. With Renbourn, Henderson recorded a couple of rare albums, There You Go (1965) and Watch the Stars (1966), and also did a 1965 single of Paul Simon's "Leaves That Are Green." Henderson had a strong, unflappable vocal presence somewhat reminiscent of a more youthful Odetta. Her repertoire encompassed all kinds of traditional folk, with a particular affinity for Appa...