谁能帮忙用英语介绍一下西方的歌剧？

Opera is a form of theatre in which the drama is conveyed wholly or predominantly through music and singing. Opera emerged in Italy around the year 1600 and is generally associated with the Western classical music tradition. Opera uses many of the elements of spoken theatre such as scenery, costumes, and acting. Generally, however, opera is distinguished from other dramatic forms by the importance of song and conventions of vocal technique. The singers are accompanied by a musical ensemble ranging from a small instrumental ensemble to a full symphonic orchestra. Opera may also incorporate dance; this was especially true of French opera for much of its history.

Comparable art forms from various other parts of the world, many of them ancient in origin, exist and are also sometimes called "opera" by analogy, usually prefaced with an adjective indicating the region (for example, Chinese opera). These independent traditions are not derivative of Western opera, but ar