commissioned by the Salzburg Festival (conducted in 2000 by Ivan Fischer, with Anna Caterina Antonacci), and the second opera for the Teatro alla Scala, Teneke (2007, chosen for the That's Opera event, on the occasion of the bicentennial of Ricordi, curated by Jean-Jacques Nattiez) conducted by Roberto Abbado, stage direction by Ermanno Olmi, with set design by Arnaldo Pomodoro. Vacchi's music was again heard at the Salzburg Festival in 2006, during the celebrations of the 250th anniversary of Mozart’s birth, with a performance by Vienna Philharmonic Orchestra under Riccardo Muti of La giusta armonia, a melologue with narrator and orchestra based on a text by the proto-socialist Franz Heinrich Ziegenhagen, who was a friend of Mozart. Worthy of mention is Voci di notte (2006), commissioned by the Orchestra of the Maggio Musicale Fiorentino, on the occasion of the 70th birthday of their conductor Zubin Mehta. Mehta is one of many conductors, such as Berio, Chung, Harding, Marriner, Pappano, and, as already mentioned Muti and Abbado, who have conducted Vacchi's music a number of times. In 2009 Riccardo Chailly conducted the symphonic melologue Prospero o dell’Armonia (by Shakespeare, Filarmonica della Scala) and in 2011 Tagebuch der Empörung (Leipzig, Gewandhaus Orchestra). Both the symphonic Mare che fiumi accoglie, conducted by Antonio Pappano at the Parco della Musica in Rome, and the opera La madre del mostro, based on a libretto by Michele Serra, date back to 2007. Amos Oz wrote the libretto of the opera The Same Sea for Vacchi, from the novel of the same name, staged at Teatro Petruzzelli in Bari, with scenery by Gae Aulenti, in 2011. Again in collaboration with Amos Oz, he composed the melologue D’un tratto nel folto del bosco, based on a text by Michele Serra from the novel of the same name (Nestled deep in a thick forest) by the Israeli writer, for the Festival Mito (which dedicated a monograph - the first Italian - to Vacchi, in 2014) of 2010. The melologue also travelled to Paris, in 2014 and in a French version (Soudain dans la forêt profonde, Comédie française, Salle Pleyel), with a CD by the Ministère de l'Éducation Nationale, designed for schools in France. In 2015, he composed a symphonic poem, Der Walddämon, again inspired by Nestled Deep in a Thick Forest by Amos Oz and commissioned by Riccardo Chailly, who conducted it at the Gewandhaus in Leipzig. In the same