Rotating aerophones
type: Concept
notation: 412.21
definition: The air itself is the vibrator in the primary sense. The vibrating air is not confined by the instrument. The interruptive agent is not a reed. The interruptive agent rotates in its own plane. Sirens, whirring disc.
in scheme: Hornbostel - Sachs
broader: Non-idiophonic interruptive instruments

Hornbostel - Sachs
type: ConceptScheme

Non-idiophonic interruptive instruments
type: Concept
notation: 412.2
narrower: Rotating aerophones