There has been considerable discussion as to the meaning of the old expression "a pair of organs;" but in Dr. Reinbault's opinion, the term meant simply an organ with more pipes than one. Some of our old poets were accustomed to use the word pair in the sense of an aggregate, and as synonymous with set.
Long before the close of the 14th century, all our abbeys and large churches were plentifully supplied with organs, and it was the practice to use two organs, one large and the other small. At first, when little more was required than to accompany the chant, the organist was one of the monks. Afterwards, when musical composition improved and more skill was required, lay organists were employed.