This film recounts a journey, a long international tour by Tosca (Tiziana Tosca Donati): Tunis, Algeria, Rio de Janeiro, Brasilia, San Paolo, Belo Horizonte, Paris, Lisbon and finally Genoa. In each city there is a concert, interesting discoveries, unexpected meetings, guests who discuss local culture and enchanting musical duets. “The Sound of the Voice” is a meeting of ideas and of different cultures, united in music, with the desire to experiment, discover and to marvel without preconceived constraints of discographies.