Aerophones: The Air Is The Instrument

An aerophone makes sound because a column or body of air is set vibrating directly — not a string, not a membrane, just moving air itself. Squeeze it, blow across it, buzz your lips into it, or just open your mouth: if the air is doing the work, it's an aerophone.

Free aerophones

The vibrating air isn't even contained in a tube. A bullroarer whirled on a cord, a whip cracked through the air, the reed of a harmonica flexing in the open — the air moves freely around the vibrating part.

Wind instruments proper

Vibrating air is confined inside a tube, and the tube's length and shape set the pitch. Flutes split an air stream over an edge. Reed instruments (clarinet, oboe, bagpipes, the humble kazoo) buzz a thin strip of cane or plastic. Brass instruments (trumpet, horn, didgeridoo) buzz the player's own lips against a mouthpiece.

Case in point: the pipe organ is a room full of aerophones wired to one keyboard — thousands of individually tuned air columns, each one its own tiny flute or reed.

And technically — your voice is one too. The vocal folds buzz, the vocal tract shapes it. The oldest aerophone ships standard with every human.

Cross-reference