Narodna muzika (Bulgarian, Macedonian, Serbian Cyrillic: Народна музика) also called Folk muzika (фолк музика) means folk music in the South Slavic languages; Bosnian, Bulgarian, Macedonian, Montenegrin and Serbian. In Slovene it is known as narodna glasba and in Croatian as narodna glazba alternatively.
For more information regarding individual nations' folk music see:
References
Narodna muzika Wikipedia(Text) CC BY-SA