Omg ppl many said that, but this voice from start is from old Slavic folk music, and i have a many more youtube link that women sing's that voice. Melody is not from there, like i said it is old Slavic. In my region we call this melody "Vlaska muzika" . And i live near Bulgaria about 10km, so we have same element of folk. It is not same, but it have something same.
Sorry i try to wrote Eng, but it is not my native language. Sorry if i made some mistake in speling...
WoW this group is great, but i didnt take it from there.
Other voices is from Imba region, "Vranjanska muzika" we call it that.
I dont whant to justify to anyone, only i can said is that enjoy in sound!!!