A capo for a musical instrument with a neck and a plurality of parallel strings disposed above the neck. The capo includes a U-shaped yoke having first and second branches, and a clamping bar assembly pivotally attached to one of the yoke branches. The clamping bar assembly includes a main bar body and a plurality of separate string clamp members, which are operatively attached to the main bar body and formed of a substantially rigid plastic material. The clamping bar assembly also includes one or more flexibly resilient cushion members provided between the string clamp members and the main bar body. The main bar body may have sockets formed therein which receive individual cushion members and portions of the string clamp members. Alternatively, the string clamp members may share a single elongated cushion member, and may have passages formed therethrough allowing for slidable mounting on a solid main bar body.