Strange to say, this "Nebuchadnezzar" libretto took hold of Verdi. Arriving home, the composer tossed the manuscript on to the table. It opened of itself at a truly felicitous passage, "Fly, O thought, on golden wings," which so interested Verdi that he read on. Finally, the whole poem was in his mind, and so disturbed his rest that he determined to return the book next day to Merelli. The _impresario_ would not have it, and told him to take the libretto away and keep it until he could find the will to set it.
_Nabucco_ was replete with beautiful passages, which, one by one, were set by Verdi, until, in the autumn of 1841, the entire opera was finished. Two stipulations Verdi now insisted upon. Signora Strepponi and Signor Ronconi were to sing in _Nabucco_, and the work was to be produced during the Carnival time. Merelli declared he could not manage the scenery in the time; but Verdi would not hear of waiting for new scenery, and consenting to risk the production with whatever chance canvas the resources of the theatre supplied, _Nabucco_ found its way into La Scala bills for the 1842 season.
The opera was given on 9th March, and both Signora Strepponi and Signor Ronconi sang in it.
"With this score," subsequently related Verdi to Signor Giulio Ricordi, "my musical career really began. With all impediments and difficulties _Nabucco_ was undoubtedly born under a lucky star. All that might have been against it proved in its favour. It is a wonder that Merelli did not send me and my opera to the devil, after the furious letter which I sent him. The second-hand costumes, made to look equal to new, were splendid, while the old scenery, renovated by Perrani, might have been painted for the occasion."
_Nabucco_ took everybody by surprise. It was a species of melodic vein and choral combination that the Milanese dilettanti had never before heard; such instrumentation, too; such novel and impressive effects were not within the memory of the oldest _habitué_ of La Scala. The Italians could not resist its peculiar "carrying-along" power. The work was unanimously declared the true ideal of what a tragic musical drama should be. Little wonder that during its rehearsals the workmen stopped to listen to the music of the new piece. Many years afterwards, in his success, Verdi referred to this incident in sympathetic words:----