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And I will also add a likely older reference: Mongolian historian G. Badraha "From the history of Mongolian music," written in 1937
A likely reference by Mongolian historian G. Badraha is "From the history of Mongolian music," written in 1937 -- this found from Badamzhavyn Batjargal's 2000 thesis in Russian, defended in Moscow, ([1]"The problem of periodization of the musical culture of Mongolia")