Answer:
They all have free rhythm.
Explanation:
Any rhythmic motion which lacks a metrical structure is known as the Free Rhythm. Though it is rarely observed in Western music it is found in Western art music of the 20th and the 21st century. The presence of free rhythm can be seen in indigenous religious, art and folk music throughout the world. The free-rhythm is more popular in Asia, Eastern Europe, the Middle East and parts of Africa.
