Organs have been made for many centuries. They are usually found in places for Christian worship such as churches and cathedrals, although they may also be found in places like town halls and concert halls or even large private houses. Very small organs can be called “chamber organs”. Organs in large churches, cathedrals or halls are very large instruments indeed, and are built especially for the building they are in. They are called “pipe organs” to distinguish them from modern “electronic organs”.