Opera sometimes includes an action.
 This opera, and the ones that would follow in Verdi's career, revolutionized Italian opera, changing it from merely a display of vocal fireworks, with Rossini's and Donizetti's works, to dramatic story-telling
 In Wagnerian operas such as the Ring Cycle, the orchestra often played the recurrent musical themes or leitmotifs, a role which gave a prominence to the orchestra which "

