By 1976, Chet Atkins and Les Paul were practically in a league of their own, and here the guitar innovators go head-to-head, picking their way through a collection of jazz and pop standards. Their take on "Caravan," originally a Duke Ellington song, sounds like a snippet from an Allman Brothers jam recorded 30 years in the future, and Al Jolson's "Avalon" becomes a drag race—both legends egg each other on as they speed down the track.