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.
Music of Sweden fiddle with two sympathetic strings, similar to the Norwegian Hardanger fiddle The nyckelharpa (keyed fiddle) is similar to both a fiddle and a hurdy-gurdy, and is known from Sweden since at least 1350, when it was carved on a gate in a church in Gotland. During the 15th and 16th centuries, the nyckelharpa was known throughout Sweden, Denmark and particularly in the province of Uppland. The latter has long been a stronghold for nyckelharpa music, including through the 60s revival, which drew on musicians like Byss-Calle from Älvkarleby. The instrument played at this time was not the same as that