Because opera normally needs scenery and costumes- oratorios do not.
Operas, and oratorios
Usually operas are not based on religious themes. You may be thinking of oratorios.
During lent.
George Frederick Handel (1685-1759)
Omniscience is nice. Oratorios and operas are usually nice.
Handel composed: * 42 operas * 29 oratorios * 120 duets and trios and cantatas
Bain Murray has written: 'The legend' -- subject(s): Librettos, Operas, Oratorios
Twenty nine. Among George Frideric Handel works, he composed 42 operas; 29 oratorios; more than 120 duets, trios and cantatas; chamber music, arias, church music; instrumental pieces, as well as 16 organ concertos.
Oratorios are sacred operas, so they are traditionally performed in churches. However, being magnificent compositions that utilise orchestra, choir and soloists, they are performed as concert pieces as well.
George Frederick Handel, composer of the Baroque Era - Born - 23rd of February, 1685 in Halle, Germany Died - 14th of April, 1759 in London, England Buried in Westminster Abbey, London Major works include - 47 Operas, 12 Concertos, 16 Oratorios. Genres - Italianate operas, English oratorios.
George Frederick Handel, composer of the Baroque Era - Born - 23rd of February, 1685 in Halle, Germany Died - 14th of April, 1759 in London, England Buried in Westminster Abbey, London Major works include - 47 Operas, 12 Concertos, 16 Oratorios. Genres - Italianate operas, English oratorios. Handel had lost his sight by the time he died.