An oratorio is a large musical composition for orchestra, choir, and soloists, typically based on a religious theme. Unlike an opera, it is performed without acting, costumes, or scenery, focusing instead on the music and the story conveyed through the lyrics. Famous examples include Handel's "Messiah" and Haydn's "The Creation". Oratorios often feature a mix of vocal styles, including arias, choruses, and recitatives. They are usually performed in concert settings, making them accessible to a wide audience. This form of music allows composers to express deep emotions and convey powerful narratives, often drawing from biblical texts or spiritual themes.