How to "compose" a khoomii song

This is an excerpt from a French documentary called Les Bardes de Gengis Khan by Nadine Assoune (in Mongolian with French subtitles), where a young boy is learning the art of khoomii singing. What I found interesting in this film is that his teacher is explaining how a khoomii song is created. Khoomii sounds are created by imitating the sounds of nature, landscape and everything that surrounds us. He tells the young boy to observe a cloud in the sky, for example: the cloud moves, then it becomes darker, the sounds become stronger, then it starts to go away, until it disappears...... No musical notes needed to "write" khoomii, just nature...... Beautiful......
Les Bardes de Gengis Khan - Un documentaire sur les traditions mongoles - Ma-Tvideo France2
À travers l’initiation d’un jeune garçons mongol, ce film explore les valeurs fondamentales de la culture mongole - l'épopée fondatrice de Gengis, le rapport intime à la nature -, et l'art insurpassable du chant épique et diphonique des Bardes de Gengis Khan.>