Cambridge’s Club 47 was the ultimate folk-music venue, and Doc Watson, the blind North Carolina guitar picker and singer, was the epitome of folksy—a perfect match. During its early-1960s peak, the club booked up-and-coming greats like Bob Dylan, Joan Baez and Tom Rush, and Watson was recorded performing there on Feb. 10, 1963. Watson was just short of turning 40 when he arrived at Club 47, but he came off as a man who’d already lived several lifetimes. As a flatpicking guitarist, he kept things simple—Watson wasn’t up there to flaunt his virtuosity, although his skill was unquestionable. The story came first for him, the guitar was just the tool he used to tell it best. This single-CD collection crams in 26 such tracks—many of them are more traditional American folk songs, others are tunes Watson learned along the way; a few are originals. Many of them, including “Deep River Blues,” “Old Dan Tucker,” “Don’t Let Your Deal Go Down” and Merle Travis’ “I Am a Pilgrim,” have since become part of the Americana landscape; they are songs that any true-blue folk or country artist (when country was still country) was required to know. Whether singing the blues like “Sitting on Top of the World” or picking a rag— he’s joined by guitarist John Herald for two of them here—Watson was a master of his craft, and this valuable document displays him in peak form throughout.