What aspect of performing an oratorio sets it apart from a musical theater production?

An oratorio is distinguished from musical theater primarily by its thematic focus, which is often of a sacred nature. Typically, an oratorio is a large-scale musical composition for orchestra, choir, and soloists, and it is usually based on religious themes or texts, often drawing from biblical narratives. This sacred foundation serves as a central aspect of its purpose and presentation.

In contrast, musical theater productions cover a wide range of themes, often including secular topics such as romance, social issues, and personal stories, and they incorporate varying styles and genres in their narratives. While both forms can involve rich musical composition and storytelling, the core distinction lies in the oratorio's dedication to religious or spiritual content.