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An oratorio is a large-scale musical composition for solo voices, chorus, and orchestra, typically on a sacred or semisacred subject. While dramatic in method, it is not intended for theatrical performance and can be presented in churches or concert halls. The text is usually based on scripture, with narration, arias, and choruses moving the story forward.12

A choir is an organized group of singers, with more than one voice to each part. Historically, choirs have been integral to church services, evolving from unison plainsong to complex polyphonic music. Oratorio choirs, in particular, often draw from augmented church choirs and provide an outlet for amateur singers.345

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