Doc Watson (born Arthel Lane Watson; March 3, 1923 – May 29, 2012) was a blind American guitarist, songwriter, and singer of bluegrass, folk, country, blues, and gospel music. Watson won seven Grammy awards as well as a Grammy Lifetime Achievement Award. Watson's flatpicking skills and knowledge of traditional American music are highly regarded. He performed with his son, guitarist Merle Watson, for over 15 years until Merle's death in 1985 in an accident on the family farm. (More from Wikipedia)
The entry on the Carter Family in Allmusic (by David Vinopal) includes: "Comprised of a gaunt, shy gospel quartet member named Alvin P. Carter and two reserved country girls – his wife, Sara [Dougherty Carter], and their sister-in-law, Maybelle [Addington Carter] – the Carter Family sang a pure, simple harmony that influenced not only the numerous other family groups of the '30s and the '40s, but folk, bluegrass, and rock musicians like Woody Guthrie, Bill Monroe, the Kingston Trio, Doc Watson, Bob Dylan, and Emmylou Harris, to mention just a few. It's unlikely that bluegrass music would have existed without the Carter Family."
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This would be a good time to relate my recent purchase of a one-of-a-kind, three-disc album called Will the Circle be Unbroken (1972). Unlike nearly all of the other rock and country collaborations that I know about, in this case the rockers hand the keys off to country music legends and let them drive. Ostensibly (or even technically) a Nitty Gritty Dirt Band album, Wikipedia calls the album a "collaboration from many famous bluegrass and country-western players, including Roy Acuff, 'Mother' Maybelle Carter, Doc Watson, Earl Scruggs, Merle Travis, Pete 'Oswald' Kirby, Norman Blake, Jimmy Martin, and others. It also introduced fiddler Vassar Clements to a wider audience."
(February 2015)