“…Greenlandic Eskimos retain a tritonic tradition [351], whereas Alaskan and Canadian Inuits use pentatonic and tetratonic songs [352]. "Tribal peoples" of India, especially in northeast, e.g., Juang, Bhuyan, and Adi, use predominantly tetratonic, tritonic, and ditonic monody, in sharp contrast to the rest of India [353]. Tetratonic genres survive amongst indigenous populations of North Vietnam and Southeast China [666,667], where they might be promoted by lexical tones [667].…”