Final answer:
Giuseppe Verdi is recognized as the most important Italian opera composer of the late 19th century, known for his emotionally intense operas like Rigoletto and Aida.
Step-by-step explanation:
The most important Italian opera composer of the last half of the 19th century is Giuseppe Verdi. His works are recognized for their emotional intensity, memorable melodies, and profound dramatic sense. Verdi's operas remain staples in the repertoire of opera houses worldwide, and he is celebrated for operas such as Rigoletto, Il Trovatore, La Traviata, and Aida. These operas showcase Verdi's talent for combining powerful characters, complex human emotions, and an innovative approach to musical composition that has endured over time. Furthermore, Verdi's importance in the music world has been commemorated through performances in grand venues such as the famous Arena of Verona.