1. A method for generating a listener-interest-filtered work for an audio or audio-visual work, which method comprises steps of: generating one or more average speed contours for one or more audio or audio-visual works for one or more categories of users; converting the one or more average speed contours to one or more conceptual speed association data structures; and forming a listener-interest-filtered conceptual speed association data structure from the one or more conceptual speed association data structures.