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Wikipedia says…

A hurdy gurdy (also known as a wheel fiddle) is a stringed musical instrument in which the strings are sounded by means of a rosined wheel which the strings of the instrument pass over. This wheel, turned with a crank, functions much like a violin bow, making the instrument essentially a mechanical violin. Melodies are played on a keyboard that presses tangents (small wedges, usually made of wood) against one or more of these strings to change their pitch. Like most other acoustic string instruments, it has a soundboard to make the vibration of the strings audible.