Elizabeth "Libba" Cotten was an American blues and folk musician, singer, and songwriter. A self-taught left-handed guitarist, Cotten developed her own original style. She played a guitar strung for a right-handed player, but played it upside down, as she was left-handed. This position required her to play the bass lines with her fingers and the melody with her thumb. Her signature alternating bass style has become known as "Cotten picking".