In the 18th century, new philosophical and social movements began to appear in Europe, replacing standards of absolute monarchy. Opera is perhaps the best representation of this shift, as it transitioned from artificiality to authenticity during the classical period (1750–1830), and then went deeper to present a true picture of the human spirit.
Composers C.W. Gluck and Wolfgang Amadeus Mozart laid the foundation for the new genre, with simple music and realistic plots, instead of relying on the extravagant music and artificial characters of the Baroque opera (1600–1750), to explore the complexities of human emotions.

The Rise of Classical Opera
The classical period marked a transition from the elaborate and ornate style of Baroque opera to a more balanced and refined style. During the Baroque period, singers wore lavish costumes and sang florid arias on elaborate stages, in front of dazzled audiences.
Gluck’s Operatic Reform
C.W. Gluck (1714–1787) was one of the major reformers of opera. Baroque opera focused on showcasing pyrotechnic arias and the technical skills of singers as a form of spectacle, while Gluck emphasized the emotional impact of the story through simple music that conveyed noble sentiments; he made the recitative more musical and gave more importance to the orchestra as an accompaniment to the dramatic story.Inspired by the works of Jean-Philippe Rameau, the composer dismantled formal structures and musical ornaments, based on the ideals of antiquity. He used new structures to convey full dramatic expression, using simple melodies and harmonies of French comic opera (opéra-comique).
While Gluck composed many operas throughout his career, his “Orpheus and Eurydice” (1762) marks a milestone. Many composers retold the classical myth of Orpheus, but none compare to Gluck’s version. Gluck and his librettist Ranieri de’ Calzabigi combined words and music naturally and fluidly, developing the orchestra’s role as a dramatic accompaniment to recitatives, arias, choruses, and dances.

Mozart’s Operas
While C.W. Gluck set the foundations for classical opera, Wolfgang Amadeus Mozart (1756–1791) brought the genre to new heights, exploring the intricacies of human emotions through elegant music. Through his music, opera could express the depths of the soul.
In both his Italian and German operas, Mozart explored the emotional range of his operatic characters, writing many splendid arias, ensemble numbers, and orchestrated recitatives to develop dramatic action. “The Abduction from the Seraglio” (“Die Entführung aus dem Serail,” 1782), was Mozart’s first full-length singspiel.
Here, the composer took advantage of many operatic styles. Some arias sung by servant characters in the opera resembled popular melodies of French and English comic operas, while the heroine sang in the full opera seria style, and the ensembles combined comedy and pathos in a uniquely Mozartian way.
Mozart’s last operas portray a deeper shade of passions and the interplay of relationships. No composer since Monteverdi had managed to convey that so clearly. Mozart, along with his librettist Lorenzo Da Ponte, wrote three operas that remain unequaled for their musical quality and emotional depth: “The Marriage of Figaro,” (“Le Nozze di Figaro”), 1786, “Don Giovanni” (1787), and “So Do They All,” (“Così fan tutte”) 1790.

While other composers such as Joseph Haydn and Antonio Salieri composed operas as a form of popular entertainment, Gluck and Mozart set the tone. Gluck’s operas used simple melodies and natural emotions. Mozart expanded on that trend, prioritizing experiences rather than mythological deities, and focusing on a more dramatic style, while retaining lightness.