Choir organ

A choir organ is a specific division of a pipe organ designed to accompany singing. Organs, in general, are keyboard instruments that produce sound using pipes or reeds, with wind supplied by a mechanism controlled by the organist. These instruments can be quite large and complex, especially pipe organs found in churches.1234

While the term "choir organ" refers to a part of a larger instrument, the "positive organ" was a smaller, portable organ used from the 10th to the 17th century, often requiring two people to operate. The organ's primary role has historically included accompanying choral and congregational singing.534