This expression is difficult to understand outside the context of the theaters and the Opera, "Toi Toi Toi" is a form of good luck charm that is used before going on stage.
The origin of the expression, which is a universal custom, is still unknown to date, some explanation for example suggest that it derives from the Yiddish "tov", which literally translates as "good". There is no artist, at least in the Opera world, that does not say it before going on stage.
In the Opera world as well as in theatrical performances, wishing "good luck" is absolutely forbidden, because it is believed that it brings the opposite effect to the actor or the singer. "Toi Toi Toi", in fact, is part of that category of idioms that fall into "theatrical superstitions". This list also includes expressions such as the Anglo-Saxon "break your leg" and the not very elegant “merda merda merda" (shit shit shit) used in Italy, Spain and Portugal.
William Shakespeare (1564-1616), a character who is as famous as he is mysterious: we ignore many facts about him. The main pillar of the theater, he still influences the art world. His works, his characters have been adopted and reinterpreted since their appearance in various artistic disciplines. The Opera world included.
Let's start with my fellow citizens (TN: Mr. Mazza is from Verona): Romeo Montecchi and Giulietta Capuleti find new life in "Roméo et Juliette" by Gounoud and in Bellini's "I Montecchi e i Capuleti". And how many films have been made on the two young Veronese lovers? Many! One of which is "Romeo and Juliet", produced in 1968, and was directed by none other than the maestro Franco Zeffirelli. And how not to mention the painter Francesco Hayez with his two masterpieces "The Kiss" and "L'ultimo bacio di Giulietta e Romeo"? The musical "West Side Story" by Leonard Bernstein was also taken from the play. Here the reinterpretation lies in modernization (it is set in the 50s). This is also valid for Rossini's "Otello". Instead Verdi's "Otello" and "Macbeth" remain faithful to the original theatrical work.