Born in the same year, Verdi and Richard Wagner created parallel, mutually exclusive types of opera that figure equally among the greatest achievements of 19th-century culture. Their works remain at the heart of opera repertory at the beginning of the 21st century. Verdi appeared on the operatic scene just as the Italian bel canto tradition of Rossini, entered its waning phase. He transformed and dominated Italian opera alone for another 30 years. It was a period of constant experimentation and constant refinement of musical and dramatic means, a process that seems to have continued underground and germinated the two transcendent Shakespeare operas written 20 years after his supposed retirement.

At first it was mainly his vigour and dramatic intelligence that distinguished his operas, works that audiences could feel were continuing safely in his predecessors' footsteps. But step by step Verdi modified the rigid conventions of bel canto opera, which showed off singers at the expense of dramatic values. Verdi's genius was to dismantle the system while still giving the singers (and their audiences) melody and brilliance in ample measure. All of this was in the service of drama, as Verdi always stressed, and drama, as he saw it, emerged from the interaction of people in striking, usually dire situations - people who were characterised unforgettably by Verdi's music. No opera composer has ever assembled a more varied and vivid portrait gallery: Rigoletto, evil jester and loving father; self-sacrificing Violetta of La traviata and self-destructive Amneris of Aida; implacable Fiesco in Simon Boccanegra; the page Oscar in Ballo; the passionate Leonora of Trovatore and the tormented Leonora of Forza; the truly Shakespearean Lady Macbeth; and Verdi's own Desdemona.

His operas move rapidly, with unerring dramatic rhythm. He developed a whole new musical vocabulary, which broadened the role of the orchestra without compromising the primacy of the voice. He introduced a range of subject matter never before touched in opera; the later Verdi could be subtle, gentle, and atmospheric as well as powerful. Generations of listeners the world over, in and out of the opera house, have loved Verdi's melodies. The best of them serve the drama, capturing his characters' emotions with a warmth and directness achieved by few other composers.