Department of Information Engineering and Computer Science, University of Trento, Trento, Italy; Department of Information Engineering and Computer Science, University of Trento, Trento, Italy; Centre for Digital Music, Queen Mary University of London, London, UK; Department of Information Engineering, Universit`a Politecnica delle Marche, Ancona, Italy; Department of Information Engineering, Universit`a Politecnica delle Marche, Ancona, Italy
