The Danish Music Museum strives to offer its visitors an engaging musical expe- rience, which they achieve, in part, by exhibiting interactive installations. This report covers the design of such an installation. A user role framework is used in a review of the state of the art of musical installations, and subsequently to arrive at a design for the installation. Finite-difference time-domain techniques are used to create physical models of a bowed string and struck pitched percussion, which serves as the auditory part of the installation. Then, the history of algorithmic composition is covered and leads to the explanation of the current composition, whose main elements are split-note rhythm generation and tone row techniques. User input is provided by a Leap Motion hand tracker that allows the user to control the rhythmic and melodic content and dynamics of the piece in real-time. Prospects of future work are discussed and finally, the project is wrapped with a conclusion.