The document classifies traditional Thai musical instruments into four categories: 1. Idiophones include the ranat thum metallophone, khawng wong lek circular gong frame, and khawng wong yai larger circular gong frame. 2. Membranophones such as the taphon double-headed drum, ramna shallow drum, and thon bowl-shaped ceramic drum. 3. Chordophones like the jakhae crocodile-shaped string instrument and saw sam sai triangular string instrument made of coconut shells. 4. Aerophones including the pi wind instrument and khaen bamboo pipe ensemble from Northern Thailand.

1. Thailand