From Berio's program notes: In one episode, namely Il Campo (The Field), from my azione musicale Cronaca del Luogo, there is a virtual love duet. Two voices and several instruments 'fall in love' and follow one another in a constantly renewing relationship. As we all know, in true polyphony each voice contributes to the whole yet retains its own identity, if not complete autonomy. In Altra voce I have liberated one voice (mezzo-soprano) and one instrument (alto flute) from the whole and developed their respective autonomies and harmonic premises by, among other means, using live electronics. Now published in score and parts, with complete and detailed technical instructions for electronics. For advanced performers.