oratorio

English borrowed oratorio from Italian in the early eighteenth century. In Italian, oratorio first meant an oratory, a place of prayer. That Italian noun comes from the Latin verb orare, 'to pray' or 'to speak formally.' The musical sense arose in a specific religious setting before it spread to concert life.

In sixteenth-century Rome, prayer halls linked to Filippo Neri's circle hosted devotional exercises with music. Those gatherings came to be associated with the room itself, the oratorio. By the early seventeenth century, composers and listeners used the same word for the large sacred musical work performed there. The building lent its name to the genre.

Italian composers such as Giacomo Carissimi helped define the form in the 1600s. The oratorio resembled opera in scale and vocal writing but was usually unstaged and treated a sacred subject. English picked up both the term and the genre as continental music circulated more widely. By the 1720s, the word was at home in English musical writing.

Modern English uses oratorio for an extended composition for soloists, chorus, and orchestra, usually on a religious or solemn theme. The classic examples named in English often include works by Handel and Haydn. The word still carries a trace of its first home, because prayer gave the genre its earliest frame. A room became a form.