Columbia subject headings:
Angkola (Indonesian people)--Indonesia--Sumatra--Music.
Folk music--Indonesia--Sumatra.
Karo-Batak (Indonesian people)--Indonesia--Sumatra--Music.
Toba-Batak (Indonesian people)--Indonesia--Sumatra--Music.
Harvard subject headings:
Angkola (Indonesian people)--Indonesia--Sumatra--Music.
Folk music--Indonesia--Sumatra.
Karo-Batak (Indonesian people)--Indonesia--Sumatra--Music.
Music--Indonesia--Sumatra.
Toba-Batak (Indonesian people)--Indonesia--Sumatra--Music.
Princeton subject headings:
Folk music.
Karo-Batak (Indonesian people)--Indonesia--Sumatra--Music.
Mandailing (Indonesian people)--Indonesia--Sumatra--Music.
Music--Indonesia--Sumatra.
Toba-Batak (Indonesian people)--Indonesia--Sumatra--Music.