Opera is a drama set to music that includes elements like poetry, scenery, costumes, acting, and dancing in addition to singing and music. The document defines key components of opera like the libretto, overture, recitative, aria, ensembles, chorus, orchestra, ballet, and acts/scenes. It also provides biographical information about Giuseppe Verdi, noting he was Italy's foremost opera composer who wrote 27 operas between 1840-1893, including famous works like Rigoletto, La Traviata, Aida, Otello, and Falstaff.