Elizabeth "Libba" Cotten was an influential American folk and blues musician. She was a self-taught left-handed guitarist who played a guitar strung for a right-handed player, but played it upside down. This position meant that she played the bass lines with her fingers and the melody with her thumb. Her signature alternating bass style has become punningly known as "Cotten picking". NPR stated "her influence has reverberated through the generations, permeating every genre of music."