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.
Pehr Hörberg fiddle and nyckelharpa (keyed fiddle) are among the most common Swedish folk instruments. This instrumental genre is the biggest one in Swedish traditional music. A nyckelharpa (literally "key harp", plural nyckelharpor or sometimes keyed fiddle) is a traditional Swedish musical instrument. It is a string instrument or chordophone. Its keys are attached to tangents which, when a key is depressed, serve as frets to change the pitch of the string. The nyckelharpa is similar in appearance to a fiddle or the bowed Byzantine lira but is more closely related to the hurdy-gurdy, both employing key-actuated tangents to change the pitch.