Opera is a form of Western theatre in which music is a fundamental component and dramatic roles are taken by singers. Such a "work" is typically a collaboration between a composer and a librettist and
Macbeth at the Savonlinna Opera Festival in St. Olaf's Castle, Savonlinna, Finland, in 2007
Palais Garnier of the Paris Opéra
Audience at the Théâtre des Bouffes-Parisiens, the birthplace of Jacques Offenbach's operettas; caricature of 1860 by Émile Bayard
In music, an aria is a self-contained piece for one voice, with or without instrumental or orchestral accompaniment, normally part of a larger work.
Opera
…Singspiel and Opéra comique. In traditional number opera, singers employ two styles of singing: recitative, a speech-inflected style, and self-contained arias. The 19th century saw the rise of the continuous music drama. Opera originated in Italy at the end of the 16th century (with Jacopo Peri's mostly lost…
The farewell aria of Sultan Bajazet in Handel's opera Tamerlano (note the da capo instruction). First edition, London, 1719.
Portrait of Christoph Willibald Gluck by Joseph Duplessis, 1775