Sofia Philharmonic Orchestra, Gabriele Bellini, "Svetoslav Obretenov" Bulgarian National Choir, Enzo Dara, Nazzareno Antinori, Raina Kabaivanska, Nelson Portella, Roumen Doichov, Borislav Peev, Stoyan Balabanov - Madama Butterfly: Act II, Part I - Coro a bocca chiusa / Humming Chorus