an extended setting of a religious libretto for vocal soloists, chorus, narrator, and orchestra. An oratorio is performed in concert halls, or in a church without scenery, acting or costumes.
Some of the most famous oratorios include Bach's "Christmas Oratorio", Handel's"Messiah" and "Israel in Egypt", Haydn's "The Creation" and "The Seasons", Mendelssohn's "Elijah".