If you even think you know bluegrass, you have to know Ralph (born 1927) and Carter Stanley (born 1925), the Stanley Brothers. Parallel to Flatt & Scruggs and Bill Monroe's Blue Grass Boys, though not with their renown, were Virginians Ralph and Carter, mountain boys who took those mountains and their traditions and their songs and wove them into a traditional bluegrass sound of utter purity, simplicity, and astonishing beauty. Their first band, formed around 1947, played more of a mountain/folk music reminiscent of the old string bands, changing to their style of ultra-tradit...