I'm looking for a source for openly licensed music that's not easy to find (for me). I'm trying to find a song titled Tes Goliin Magtaal (in English). It's a song performed in Mongolian with some traditional Mongolian double voice singing. Pretty much anything that involves this style of double voice singing is desirable, not just the specific song I linked.

If it's too difficult to find an openly licensed source I'm considering commissioning someone who can sing like this to perform a few songs. Any help or references are appreciated.