The 20th century saw opera evolve dramatically, with composers like Strauss, Puccini, and Britten pushing boundaries. New styles emerged, including verismo, expressionism, and neoclassicism, reflecting the era's tumultuous social and political climate. Innovations in music, staging, and storytelling transformed opera. Composers experimented with atonality, extended vocal techniques, and unconventional narratives. These works, once controversial, are now celebrated for their artistic boldness and enduring relevance.