Gioachino Rossini common practice among deadline-pressed opera composers of the time. Few of his operas are without such admixtures, frankly introduced in the form of arias or overtures. For example, in "Il Barbiere" there is an aria for the Count (often omitted) "Cessa di più resistere", which Rossini used (with minor changes) in the cantata "Le Nozze di Teti e di Peleo" and in "La Cenerentola" (the cabaletta for Angelina's rondo is almost unchanged). Moreover, four of his best known overtures ("La cambiale di matrimonio", "Tancredi", "La Cenerentola" and "The Barber of Seville") share operas apart from those with which they are
Demetrio e Polibio Demetrio e Polibio Demetrio e Polibio (; "Demetrius and Polybius") is a two-act operatic "dramma serio" by Gioachino Rossini to a libretto by Vincenzina Viganò-Mombelli. The opera was orchestrated for strings only. "Demetrio e Polibio" was Rossini's first attempt at a full-scale opera, "assembled piecemeal" during his student days at the Philharmonic Academy of Bologna in 1806. Because it was commissioned by tenor Domenico Mombelli (whose wife wrote the libretto) and was performed privately by Mombelli and his two daughters, a performance which Rossini did not attend, it was not his first fully staged opera. The opera was not professionally