Abstract: A capo for a guitar, banjo or similar stringed instrument includes a body providing an arm for engaging the instrument's strings and a clamp mechanism operable by one hand to move the cap into and out of clamped relationship with the instrument's neck. Further the capo may be moved from one position to another along an instrument's neck or may be entirely removed from or replaced on the instrument with one hand and without the instrument having to be shifted from its normal playing position during a performance.