Senesino in the context of Castrato

Opera seria (Italian pronunciation: [ˈɔːpera ˈsɛːrja]; plural: opere serie; usually called dramma per musica or melodramma serio) is an Italian musical term which refers to the noble and "serious" style of Italian opera that predominated in Europe from the 1710s to about 1770. The term itself was rarely used at the time and only attained common usage once opera seria was becoming unfashionable and beginning to be viewed as something of a historical genre. The popular rival to opera seria was opera buffa, the 'comic' opera that took its cue from the improvisatory commedia dell'arte. An opera seria had a historical or Biblical subject, whereas an opera buffa had a contemporary subject.

Italian opera seria (invariably to Italian libretti) was produced not only in Italy but almost throughout Europe, and beyond (see Opera in Latin America, Opera in Cuba e. g.). Among the main centres in Europe were the court operas based in Warsaw (since 1628), Munich (founded in 1653), London (established in 1662), Vienna (firmly established 1709; first operatic representation: Il pomo d'oro, 1668), Dresden (since 1719) as well as other German residences, Saint Petersburg (Italian opera reached Russia in 1731, first opera venues followed c. 1742), Madrid (see Spanish opera), and Lisbon. Opera seria was less popular in France, where the national genre of French opera (or tragédie en musique) was preferred.

Gaetano Berenstadt (7 June 1687 – buried 9 December 1734) was an Italian alto castrato who is best remembered for his association with the composer George Frideric Handel. Berenstadt created roles in three of Handel's operas. Berenstadt's parents were German and his father was timpanist to the Grand Duke of Tuscany. By the end of his 27-year-long career Berenstadt had sung in 55 dramatic works, 33 of which were newly composed.

Berenstadt was born in Florence. A pupil of Francesco Pistocchi, after singing at Naples and Bologna, Berenstadt visited London in 1717, where he performed the role of Argante in a revival of Handel's Rinaldo. The original bass part, sung by Giuseppe Maria Boschi, was transposed up for Berenstadt's alto voice and in this revised version the character has three new arias composed for Berenstadt to sing. After returning to Italy to sing at Rome and Milan Berenstadt came back to London in 1722 to sing for the composers of the Royal Academy of Music (1719). It was at this time that he created the roles of Tolomeo in Handel's Giulio Cesare, the title role in Flavio, and the role of Adelberto in Ottone. He also performed in operas by Bononcini and Ariosti.