1. Different musical styles: Musicals combine pop, rock, jazz and blues styles, as well as dialogue and duet. Opera is dominated by classical music, including classical music, chorus and aria.

2. Stories are told in different ways: The stories of musicals are based on real life or fictional stories, emphasizing the emotions and interpersonal relationships of the characters, and often including the discussion of social issues. The story of opera comes from history, myth and literary works, and the plot is more complicated, emphasizing the inner world and emotional conflict of the role.