Our aim is to develop methods for a user-centered remastering of music performance recordings for giving the user an interactive multimedia experience. The idea is to guide audio source separation/enhancement using the user's attention as a high-level control/feedback to select which, for him/her, is the desired source to enhance. In the case of music performances, the source to enhance is represented by a particular instrument in the ensemble, thus we have a polyphonic music source separation problem.