The concept of body-mediated or embodied interaction, of the coupling of interface and actor, has become increasingly relevant within the domain of HCI. With the reduced size and cost of a wide variety of sensor technologies and the ease with which they can be wirelessly deployed, on the body, in devices we carry with us and in the environment, comes the opportunity to use a wide range of human motion as an integral part of our interaction with many applications. While movement is potentially a rich, multidimensional source of information upon which interface designers can draw, its very richness poses many challenges in developing robust motion capture and gesture recognition systems. In this talk, I will suggest that lessons learned by designers of computer-based musical instruments whose task is to translate expressive movement into nuanced control of sound may now help to inform the design of movement-based interfaces for a much wider range of applications.