A blown idiophone is one of the categories of musical instruments found in the Hornbostel-Sachs system of musical instrument classification. These idiophones produce sound when stimulated by moving air. For example, the aeolsklavier (below) features sticks while the piano chanteur features plaques.
This group is divided in the following two sub-categories:
The aeolsklavier (æolsklavier) is an unsuccessful keyboard wind instrument containing wooden reeds and invented in 1825 by Schortmann of Buttelstädt. The sound was produced by a jet of air which put in motion a set of vibrating blades of very thin wood. It was equipped with a keyboard and with a pedal which triggered a set of bellows (one for each note) and produced a soft and ethereal sound.