How did French grand opera influence Giuseppe Verdi's middle-period works?

During his middle period, Giuseppe Verdi sought to compete with the prevailing Parisian operatic standards, which demanded spectacular, high-seriousness dramas in five acts featuring ballet and elaborate staging. By adopting these conventions, Verdi aimed to challenge the dominance of Giacomo Meyerbeer, the most renowned composer of the era.1

This influence is evident in several ways:

• Structural Adaptation: Verdi’s works from 1855 to 1870, such as Les Vêpres siciliennes (1855), were specifically crafted to conform to the requirements of the Paris Opéra.1
• Grandeur and Spectacle: In Aida (1871), Verdi successfully integrated the heroic quality and visual spectacle characteristic of French grand opera with his own signature emotional intensity, vivid character portrayal, and mastery of orchestral color.12
• Refinement of Style: While early attempts like Les Vêpres siciliennes were criticized for being cold, Verdi eventually achieved a balance where he utilized the grandeur of the Parisian style without its excessive padding, ultimately grafting it onto his own dramatic sensibilities.1

Even in works for Italian theaters, such as Simon Boccanegra and Un ballo in maschera, the impact of the grand operatic style is visible in the enrichment of his orchestral color and dramatic scope.1