Abstract: A capo for stringed instruments comprising a rollable cylindrical pressure member mounted at its opposite ends by a central rod extending in its central longitudinal axis. A neck attachment member, in the form of a flexible strap, extends around the undersurface of the neck and is secured to a pair of transversely-spaced mounting elements by means of an elastic tensioning member. The mounting elements also support the rod. The tensioning member is tensionally adjustable. The capo is adapted for permanent installation on a stringed instrument. A position-locking foot is provided for the capo when it is used with stringed instruments of the fretted type.