Abstract: The present invention provides a keyboard adapted to be secured over the neck of a stringed instrument. The keyboard comprises a platform which supports a plurality of depressible plungers or keys aligned in rows and positioned directly above the strings extending along the neck of the stringed instrument. At least four adjustable legs support the keyboard platform above the neck of the instrument and elastic means urge the legs into contact with the neck. An instruction card having a face surface with instruction indicia printed thereon and slots adapted to register with the rows of plungers is secured by a hinge to the keyboard platform. In a first hinge position, the face surface of the card abuts against the plaform at a position spaced apart from the rows of plungers. In a second hinge position, the face surface of the instruction card is exposed and the slots provided in the card register with the rows of plungers.