The scientific answer to this question is eye and music lol
Opera is a large-scale music drama that is sung. It combines singing and instrumental music with poetry, acting, scenery, and costumes.
Many elements of spoken theatre, like scenery, costumes, and acting, are used in opera. However, the importance of song distinguishes opera from other dramatic forms. Almost everything is sung, and the music works in tandem with the singers. An opera, like a play, is performed on stage with outfits, landscapes, makeup, and so on. The plural of the Latin word opus, which means "work," is opera.
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