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 to Vivaldi. At this time the most common style of hurdy-gurdy developed, the six-string "vielle à roue". This instrument has two melody strings and four drones. The drone strings are tuned so that by turning them on or off, the instrument can be played in multiple keys (e.g., C and G, or G and D). During this time the hurdy-gurdy also spread further to Central Europe, where further variations developed in western Slavic countries, German-speaking areas and Hungary (see the list of types below for more information on them). Most types of hurdy-gurdy were essentially extinct by the early twentieth