In this project we have developed reactive instruments for performance. Reactive instruments provide feedback for the performer thereby providing a more dynamic experience. This is achieved through the use of haptics and robotics. Haptics provide a feedback system to the control surface. Robotics provides a way to actuate the instruments and their control surfaces. This allows a highly coordinated "dance" between performer and the instrument. An application for this idea is presented as a linear slide interface. Reactive interfaces represent a dynamic way for music to be portrayed in performance.