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.

NPR: On 'Cigarette Case,' Spoon Is a Band of Few Words

"The solo guy with an acoustic guitar, in my mind, seems to me to be the hardest path to take, " Hanson says.

NPR: Jeff Hanson: 'Nothing Would Matter At All'

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.

CNN: Watson leaves notes strung through music history