A capo for use with a dobro or similar stringed instrument. The capo includes upper and lower curved bar members, each bar member having a horizontal arm portion and a downwardly curved arm portion meeting at a juncture. The upper and lower curved bar members are pivotally attached to each other adjacent the junctures of their horizontal and downwardly curved arm portions. A slot extends longitudinally in the mid-portion of the downwardly curved arm portion of the upper curved bar member, and a cam locking lever is pivotally mounted within the slot. A string hold down bar is pivotally mounted to the outer end of the horizontal arm portion of the upper curved bar member.