Ivanhoé is an 1826 pastiche opera in three acts with music by Gioachino Rossini, the  music was adapted, with the composer's permission, by the music-publisher Antonio Pacini from Rossini's operas, namely La gazza ladra, is a "melodramma" or opera semiseria in two acts by Gioachino Rossini, with a libretto by who?
Ivanhoé Ivanhoé is an 1826 pastiche opera in three acts with music by Gioachino Rossini to a French-language libretto by Émile Deschamps and Gabriel-Gustave de Wailly, after Walter Scott's novel of the same name. The music was adapted, with the composer's permission, by the music-publisher Antonio Pacini from Rossini's operas, namely "Semiramide", "La Cenerentola", "La gazza ladra", and "Tancredi" in order to introduce his music to Paris. An examination of the score shows that Pacini also used music from "Bianca e Faliero", "Armida", "Maometto II", "Aureliano in Palmira", "Sigismondo", "Torvaldo e Dorliska", "Mosè in Egitto" and an amount of newly composed music including fanfares and the gallop that was later to become famous from its inclusion in "Guglielmo Tell". The work was premiered on 15 September 1826, at the Odéon Theatre.
Orlando furioso (Vivaldi, 1714) Orlando furioso RV 819 (] , Teatro San Angelo, Venice 1714) is a three-act opera surviving in manuscript in Antonio Vivaldi's personal library, only partly related to his better known Orlando furioso (RV 728) of 1727. It is a recomposition of an "Orlando furioso" written by Giovanni Alberto Ristori which had been very successfully staged by Vivaldi and his father's "impresa" in 1713, and whose music survives in a few fragments retained in the score of RV 819. Therefore, Vivaldi's first cataloguer Peter Ryom did not assign the opera a RV number, but catalogued it as RV Anh. 84. The libretto was by Grazio Braccioli.