Royal Ballet of Cambodia 2. The Dance School (1965) 

A film made in 1965 about the Royal Ballet of Cambodia, featuring performances and an introduction to the tradition. I have not been able to find out who made the film, but it is now in the public domain. I have split the film into four sections:
1. The Story of Jayavarman II (about the founder of Angkor)
2. The Dance School (training sessions)
3. The Hermit and the Kinnari (a delightful tale)
4. An Offering to the Ancestors (a royal offering)
The section goes backstage to see the training and preparation involved in the dance.