We show how body-centric sensing can be integrated in musical interface toenable more flexible gestural control. We present a barehanded body-centricinteraction paradigm where users are able to interact in a spontaneous waythroughperforming gestures. The paradigm employs a wearable camera and see-throughdisplay to enable flexible interaction in the 3D space. We designed andimplemented a prototype called Air Violin, a virtual musical instrument usingdepth camera, to demonstrate the proposed interaction paradigm. We describedthe design and implementation details.