Thai classical music is synonymous with those stylized court ensembles and repertoires that emerged in its present form within the royal centers of Central Thailand some 800 years ago. These ensembles, while being deeply influenced by Khmer and even older practices and repertoires from India, are today uniquely Thai expressions. While the three primary classical ensembles, the Piphat, Khrueang sai and Mahori differ in significant ways, they all share a basic instrumentation and theoretical approach. Each employ the small ching hand cymbals and the krap wooden sticks to mark the primary beat reference.