A Boogie Woogie styled fill during a 12-bar-blues on the I chord, this time double stops that almost fit a country rock song. In other cases, Perkins would use single string blues picking as "answer fill" to answer the sung vocal lines or follow the chord progression with a more neatly played rock n roll shuffle.
source:
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(Country Music A New Tradition - TV Special, available on VHS)
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