The Dream Hunt (Na'vi name: Uniltaron) is a rite of passage, in which Na'vi seek their spirit animal. During a chemically induced trance caused by the bite of an arachnoid and swallowing a glow worm, they express themselves musically as the spirit moves.
Uniltaron songs are especially interesting. While under the chemically induced effects that mark the Dream Hunt, a Na'vi may utilize any kind of expression: standard social song structures, imitations of domestic cascading vocal style, children's songs from deep in their memories, wildly improvised songs or chants. The only type of songs not heard in this context are personal songs and the ritual songs of mourning.