String instrument rosin than players of lower-pitched instruments, who tend to favor darker, softer rosin. The ravanahatha is one of the oldest string instruments. Ancestors of the modern bowed string instruments are the rebab of the Islamic Empires, the Persian kamanche and the Byzantine lira. Other bowed instruments are the rebec, hardingfele, nyckelharpa, kokyū, erhu, igil, sarangi and K'ni. The hurdy-gurdy is bowed by a wheel. Rarely, the guitar has been played with a bow (rather than plucked) for unique effects. The third common method of sound production in stringed instruments is to strike the string. The piano and hammered dulcimer use
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.