Hierarchy classification:

1. top of the aat hierarchies
2. Physical Attributes Facet
3. Attributes and Properties (hierarchy name)
4. [attributes and properties by specific type]

Additional parents:

1. top of the aat hierarchies
2. Physical Attributes Facet
3. Attributes and Properties
4. attributes and properties by specific type
5. musical range attributes

Anotations

Scope note:

Generally, having a basis in the normal constitution and operation of things as found in nature unaffected or minimally affected by humans. Specifically with reference to aerophones, having no valves, keys, or other mechanical means of altering the pitch produced by the instrument.