Hurdy-gurdy twenty-three different forms, and there is still no standardized design today. The six-stringed French "vielle à roue" is the best known and most common sort. A number of regional forms developed, but outside France the instrument was considered a folk instrument and there were no schools of construction that could have determined a standard form. There are two primary body styles for contemporary instruments: guitar-bodied and lute-backed. Both forms are found in French-speaking areas, while guitar-bodied instruments are the general form elsewhere. The box form of the "simphonia" is also commonly found among players of early music and historical re-enactors.
Hurdy-gurdy and France, but was largely replaced by the "symphonia", a small box-shaped version of the hurdy-gurdy with three strings and a diatonic keyboard. At about the same time, a new form of key pressed from beneath was developed. These keys were much more practical for faster music and easier to handle; eventually they completely replaced keys pulled up from above. Medieval depictions of the "symphonia" show both types of keys. During the Renaissance, the hurdy-gurdy was a very popular instrument (along with the bagpipe) and the characteristic form had a short neck and a boxy body with a curved tail