Is all folk music written in simple notation?

Folk music is not always written in simple notation, but some of it is written in pentatonic.

Folk music is based on the pentatonic mode. The so-called pentatonic modulation is a modulation of five tones: Gong, Shang, Horn, Zheng, and Feather, similar to 1, 2, 3, 5, and 6 in a simple score.The hexatonic modulation and heptatonic modulation in folk music are developed on the basis of the pentatonic modulation.

Traditional Chinese music is generally written in pentatonic scale, such as the folk songs "Jasmine Flower", "The River Runs Through It", and "Five Brothers Herding Sheep", the instrumental pieces. "Moonlit Night of Spring River", "Three Plum Blossoms" ... And so on. In the past, there are often people who are not allowed to sing is called "five tones", here the "five tones" refers to the five tones in the pentatonic modulation.