Frankly, "Case" sounds on the verge of imploding as it is, with an acoustic-guitar solo that might be called flamenco if it weren't so scattershot and an otherwise-simple quarter-note pulse, which creates the illusion that the song's center is constantly shifting.
Watson, who died on Tuesday at age 89, is most closely associated with the melodic style of flatpicking that cemented the guitar's role as a solo voice in bluegrass and acoustic country music.