An aerophone (/ˈɛərfn/) is a musical instrument that produces sound primarily by causing a body of air to vibrate,[1] without the use of strings or membranes (which are respectively chordophones and membranophones), and without the vibration of the instrument itself adding considerably to the sound (or idiophones).[2]

Flutes are aerophones

According to Sachs,[3]

Aerophones or 'air instruments' include what are usually called 'wind instruments,' with the addition of a few instruments with a different acoustical principle called 'free aerophones.'
A wind instrument has two essential factors: a tube enclosing a column of air, and a device for setting that air into vibration by interrupting into pulsations the steady breath of the player (or the wind of a bellows).

These may be lips, a reed, or a sharp edge. A free aerophone lacks the enclosed column of air yet, "cause a series of condensations and rarefications by various means."

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