Claim: The polyphonic singing of the Aka Pygmies can be subdivided into up to four parts described as an "ostinato with variations" similar to a passacaglia in that it is cyclical; then, in 2008, it was relisted on the Representative List of the Intangible Cultural Heritage of Humanity, one of the 508 elements corresponding to 122 countries.
Evidence: The polyphonic singing of the Aka Pygmies was relisted on the Representative List of the Intangible Cultural Heritage of Humanity in 2008. Mbenga–Mbuti Pygmy music consists of up to four parts and can be described as an "ostinato with variations" similar to a passacaglia in that it is cyclical. The list totaled 508 elements corresponding to 122 countries as of 2018.