Hurdy-gurdy Hurdy-gurdy The hurdy-gurdy is a stringed instrument that produces sound by a hand crank-turned, rosined wheel rubbing against the strings. The wheel functions much like a violin bow, and single notes played on the instrument sound similar to those of a violin. Melodies are played on a keyboard that presses "tangents"—small wedges, typically made of wood—against one or more of the strings to change their pitch. Like most other acoustic stringed instruments, it has a sound board and hollow cavity to make the vibration of the strings audible. Most hurdy-gurdies have multiple drone strings, which give a constant pitch accompaniment
Hurdy-gurdy Is Made), known through a much later copy, but its authenticity is very doubtful. Another 10th-century treatise thought to have mentioned an instrument like a hurdy-gurdy is an Arabic musical compendium written by Al Zirikli. One of the earliest visual depictions of the organistrum is from the twelfth-century "Pórtico da Gloria" (Portal of Glory) on the cathedral at Santiago de Compostela, Galicia, Spain: it has a carving of two musicians playing an organistrum. Later on, the "organistrum" was made smaller to let a single player both turn the crank and work the keys. The "solo organistrum" was known from Spain