Chilean pan pipes, an example of an aerophone.
An aerophone is a musical instrument, such as a trumpet or a flute, in which sound is generated by a
vibrating column of air. A free-reed aerophone is one, such as an accordion, in which sound is produced as air flows past a vibrating reed in a frame. Air pressure is typically generated by breath or bellows.
Aerophones comprise one of the categories in the Hornbostel-Sachs classification system.