Far from being "authentic" or "traditional", we attempted to borrow from the sonic palette of traditional Cambodian music to create something slightly contemporary, referencing the Chapei dong veng (a plucked string instrument), the Roneat (xylophone-type instrument), and other instruments prevalent in the traditional Pinpeat ensembles.
Read more about the film at http://www.angkorawakens.com/.
(Image above is a still from the film, featuring shadow puppets from Scott Hitz!)