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-traditional bluegrass when Monroe's band became popular. Even on their recordings in the early '50s, the Stanleys' unmistakable sound is there, with guitarist Carter singing lead and banjo player Ralph singing tenor harmony. In the opinion of many, Carter possessed the best lead voice in bluegrass history -- rich, emotional, and (in the best sense of the word) lonely. He took a happy song and sang it sad; he took a sad song and sang it sadder. And Ralph's unworldly mountain tenor matched his brother's voice perfectly, soaring above and often lightening the emotional load of the lyrics, creating a duet unsurpassed in country history.