Ditte Andersson plays the nyckelharpa. The nyckelharpa is a string instrument . With a short bow to their strings in vibration offset. The pitch of the melody string (s) is driven by the pressing of buttons, the "keys", determined - similar to the hurdy-gurdy . These buttons are also used as tangents described. There are many forms of nyckelharpa. A modern, chromatic nyckelharpa has four melody strings, which are played with the bow. Depending on the design of the keyboard can be many different (usually three or four) melody strings are shortened with the tangents, thus changing the pitch. The open strings are used as drones.