House music on a small organ with two small bellows on the backside, called positive, establishment in the 15th century, Germany. A positive organ,o positiv organ, positif organ, portable organ, chair organ, or simply positive, positiv, positif, or chair is a small, usually one-manual, pipe organ that is built to be more or less mobile. It was common in sacred and secular music between the 10th and the 18th centuries, in chapels and small churches, as a chamber organ, digital improved reproduction of a woodcut publication in the year 1885