Opera is a form of Western theatre characterized by music as a fundamental component where dramatic roles are performed by singers. These works typically represent a collaboration between a composer and a librettist, integrating various performing arts including acting, scenery, costumes, and occasionally dance or ballet.
Performances generally take place in an opera house and are accompanied by an orchestra or a smaller musical ensemble. Since the early 19th century, these ensembles have typically been led by a conductor. While closely related to musical theatre, opera is considered a distinct art form.