Serng Krapo (Coconut Dance) Krapo is the word for coconut in the Northeast dialect. The dance illustrates the activities of a group of nubile girls from the southern part of the region, known as I-San. The dancers hold two coconut shells, with which they execute complex choreographic movements, shaking them, tossing them or tapping them lightly. This dance is often accompanied by the sound of the pong lang, a kind of upright xylophone, made of strips of wood arranged according to the musical scale.