Watson, who was blinded as a child, was known for his lightning-fast style of flatpicking which influenced guitarists around the world.
BBC: Doc Watson, folk and bluegrass guitarist, dies aged 89
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The flatpicking turned heads, but the tune that followed it might be a fingerstyle blues, a Travis-flavored country bounce or a parlor song from the Carter repertoire.
CNN: Watson leaves notes strung through music history
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Watson's mastery of flatpicking helped make the guitar a lead instrument in the 1950s and 1960s, when it was often considered a backup for the mandolin, fiddle or banjo.
BBC: Doc Watson, folk and bluegrass guitarist, dies aged 89