Columbia subject headings:
Boys' choirs--Germany--History--20th century.
Choral music--Germany--History--20th century.
Regensburger Domspatzen--History.
Harvard subject headings:
Boys' choirs--Germany--Regensburg--History--20th century.
Choirs (Music)--Germany--Regensburg--History--20th century.
Church music--Germany--Regensburg--History--20th century.
Music--Instruction and study--Germany--Regensburg--History--20th century.
Regensburger Domspatzen--History.
Princeton subject headings: