The world premiere of Arrigo Boito’s Mefistofele on 5 March 1868 at Teatro alla Scala was a disaster.
On the aesthetic level, the opera’s unconventional melodies, harmonies, allocation of voices, and voice leading were jarring for the puzzled audience.
Even worse, in this work Boito repudiated the era’s emphasis on Italian nationalism and sought to stimulate philosophical thought and analysis. This cultural treason was viewed as a serious offense during the Italian Risorgimento, and Boito was forced to revise the opera; his reputation as a librettist suffered as well.
This according to La prima de Mefistofele e il Risorgimento: Pubblico e riforma del teatro musicale nella Milano postunitaria by Stefano Lucchi, a dissertation accepted by Universität Wien in 2009.
Today is the 150th anniversary of Boito’s disastrous premiere! Of course, now the opera is his best-loved work. Below, Renata Tebaldi sings the celebrated aria L’altra notte in fondo al mare.
Although Arrigo Boito devoted 56 years to the composition of his Nerone, at his death the opera was still incomplete; Arturo Toscanini bustled to refine and finish the last act for the work’s premiere at La Scala on 1 May 1924.
Since the figure of the mad psychopath Nero is best remembered in the collective imagination as he plays and sings while observing the Great Fire of Rome, for the first staging of the opera a true kithara was made by the lute maker Piero Parravicini at the Milan workshop of Antonio Monzino e Figli; today the instrument is on display at the Civico Museo degli Strumenti Musicali in Milan.
This according to “‘Or che i Numi son vinti, a me la cetra, a me l’altar!’: Kithara constructed for the premiere of Arrigo Boito’s Nerone” by Donatella Melini (Music in art XL/1–2  pp. 267–72).
Above, the instrument in question (click to enlarge); below, the scene referred to in the article’s title.