Non-idiophonic interruptive instruments
Idiophonic interruptive aerophones or reeds
The air itself is the vibrator in the primary sense. In this group also are classed those reed instruments sounded by a flow of air in which the reed is the primary vibrator. The vibrating air is not confined by the instrument. The air-stream is interrupted periodically.
Interruptive free aerophones
Hornbostel - Sachs
Free aerophones