The main difference between Opera and the previous polyphonic vocal music is the unique melodic line, resulting from the merging of bass and singing. In polyphonic music different vocal lines work independently, overlapping one another and making a text often incomprehensible. Opera instead offered a new way for making words expressive and intelligible, by creating a single melodic line, supported by an accompaniment.
Rossini wrote his first opera, Demetrio e Polibio in 1806 not even fifteen. His official debut was in Venice in 1810 with the opera La Cambiale di Matrimonio. In the following two decades Rossini composed 39 operas, 4 or 5 new ones per year, with some controversial premieres, such as the Barber of Seville legendary fiasco in Rome in 1816 and some extraordinary successes: La Gazza Ladra, Zelmira and Semiramide, the last opera premiered in Italy in 1823.
The libretto for Monteverdi’s Opera L’Incoronazione di Poppea was mainly drawn from the roman historians Tacitus. Its leading character is Poppea, the beautiful mistress who became wife to the Roman Emperor Nero, one of the most loved and, at the same time, hated emperor of the ancient Rome. Nero after the great fire of Rome, built on the Colle Oppio, the most lavish and vast villa of the ancient Rome, the Domus Aurea.
In Stendhal’s opinion Tancredi was Rossini’s best opera. In his biography he wrote: “there’s no bravery or grandeur in this opera but only the simple purity and virginity of genius”. The libretto by Gaetano Rossi was drawn from Voltaire’s tragedy Tancrede. For that libretto Rossini composed an innovative score, combining in an original way the baroque “extreme coloraturas” with the pre-Romantic simple melodies of the new belcanto.