Types of jaw harp
Explore the two main construction types of jaw harp and the different ways their tongues are made.
Jaw harp types — idioglot and heteroglot
In organological classification, there are two main types: idioglot jaw harps have a tongue cut directly from the body of the instrument, while heteroglot jaw harps have a separate tongue attached to the frame.
Idioglot jaw harps
Idioglot — an integral tongue
The tongue is cut from the same piece of bamboo, wood or sheet metal as the frame, with its base remaining joined to the instrument body.
Key features:
- Made from one piece of material
- Tongue cut from the main body
- A simpler construction
- Often made from bamboo, wood or brass sheet
Typical example:
Vietnamese dan moi — most often made from brass sheet
Heteroglot jaw harps
Heteroglot — a separate tongue
These jaw harps have a rigid frame and a separate flexible tongue that is riveted, pressed or otherwise attached to the frame.
Key features:
- Two main components: frame and tongue
- A tongue made from suitable spring steel
- A more demanding construction
- A strong, clearly articulated sound
Tongue materials:
- Drawn steel
- Hardened or tempered steel
- Mechanical properties chosen for flexibility and durability
Most familiar European metal jaw harps are heteroglot: they have a metal frame and a separate steel tongue.
Comparison of the two types
| Feature | Idioglot | Heteroglot |
|---|---|---|
| Construction | Made from one piece of material | Frame with a separate tongue |
| Manufacture | Simpler | More demanding |
| Typical materials | Brass, bamboo or wood | Iron or steel frame and a steel tongue |
| Sound | Often softer and more intimate | Often stronger and more projecting |
| Care | Simpler | More attention to clearance and corrosion |
Regional traditions
These are construction categories, not rigid regional labels. Idioglot types are documented in India, Indonesia and Melanesia, while heteroglot types occur in Europe, India and China.
Materials and traditions
Material alone does not determine the category. What matters is whether the tongue is integral to the body or attached to the frame as a separate part.
- Idioglot types: bamboo, wood or flexible sheet metal
- Heteroglot types: a metal frame with a separate steel tongue
Classification follows the Hornbostel–Sachs system: MIMO groups 121.21 and 121.22.
