His Petite Messe Solennelle for twelve voices was 
His Petite Messe Solennelle for twelve voices was written shortly before his death and other works of his include The Sins of Old Age, a collection of thirteen volumes of vocal and instrumental music. Known primarily for opera, he achieved wide acclaim for an opera based on a Voltaire work, Tancredi. Because of public demand, he wrote an alternative "happy ending" for his Otello and his writing style gained him the nickname "Monsieur Crescendo." Other successes included Elisabetta and The Italian Girl in Algiers. A later visit to Vienna ended with a benefit where he joined the crowd in singing his "Largo al factotum" from his most famous opera. FTP, identify this opera composer who stopped writing opera at the age of 37 after completing William Tell and who is best known for The Barber of Seville.
His Petite Messe Solennelle for twelve voices was written shortly before his death and other works of his include The Sins of Old Age, a collection of thirteen volumes of vocal and instrumental music.
Gioacchino Rossini