Nabucco (, short for Nabucodonosor ; ) is an Italian-language opera in four acts composed in 1841 by Giuseppe Verdi to an Italian libretto by Temistocle Solera. The libretto is based on the biblical books of 2 Kings, Jeremiah, Lamentations and Daniel and the 1836 play by Auguste Anicet-Bourgeois and Francis Cornu. However, Antonio Cortese's ballet adaptation of the play (with its necessary simplifications), given at La Scala in 1836, was a more important source for Solera than the play itself. Under its original name of Nabucodonosor, the opera was first performed at La Scala in Milan on 9 March 1842. Nabucco is the opera that is considered to have permanently established Verdi's reputation as a composer. He commented that "this is the opera with which my artistic career really begins. And though I had many difficulties to fight against, it is certain that Nabucco was born under a lucky star." The opera follows the plight of the Jews as they are assaulted, conquered and subsequently exiled from their homeland by the Babylonian king Nabucco (Nebuchadnezzar II). The historical events are used as background for a romantic and political plot. The best-known number from the opera is the "Chorus of the Hebrew Slaves" ("Va, pensiero, sull'ali dorate" / "Fly, thought, on golden wings"), a chorus that is regularly given an encore in many opera houses when performed today. Composition history The success of Verdi's first opera, Oberto, led Bartolomeo Merelli, La Scala's impresario, to offer Verdi a contract for three more works. After the failure of his second opera Un giorno di regno (completed in 1840 towards the end of a brutal two-year period during which both of his infant children and then his 26-year-old wife died), Verdi vowed never to compose again. In "An Autobiographical Sketch", written in 1879, Verdi tells the story of how he came to be twice persuaded by Merelli to change his mind and to write the opera. The duration of 38 years since the event may have led to a somewhat romanticized view; or, as Verdi scholar Julian Budden writes: "he was concerned to weave a protective legend about himself [since] it was all part of his fierce independence of spirit." However, in ("Where there's a will ...") – written ten years closer to the event – the zoologist Michele Lessona provides a different account of the events, as allegedly recounted by Verdi himself.