An oratorio (Italian pronunciation: [oraˈtɔːrjo]) is a large musical composition for orchestra, choir, and soloists. Like most operas, an oratorio includes the use of a choir, soloists, an instrumental ensemble, various distinguishable characters, and arias. However, opera is musical theatre, while oratorio is strictly a concert piece – though oratorios are sometimes staged as operas, and operas are sometimes presented in concert form. In an oratorio, the choir often plays a central role, and there is generally little or no interaction between the characters, and no props or elaborate costumes. A particularly important difference is in the typical subject matter of the text. Opera tends to deal with history and mythology, including age-old devices of romance, deception, and murder, whereas