"An oratorio (Italian pronunciation: [ora\u02C8t\u0254\u02D0rjo]) is a large musical composition for orchestra, choir, and soloists. Like an opera, an oratorio includes the use of a choir, soloists, an ensemble, various distinguishable characters, and arias. However, opera is musical theatre, while oratorio is strictly a concert piece\u2014though oratorios are sometimes staged as operas, and operas are sometimes presented in concert form."@en . .