Columbia subject headings:
Harvard subject headings:
Carols, German
Choruses, Sacred (Mixed voices) with orchestra
Choruses, Sacred (Mixed voices) with piano
Christmas music
Sacred songs with instrumental ensemble
Sacred vocal duets with guitar
Sacred vocal duets with organ
Sacred vocal duets with string orchestra
Sacred vocal duets, Unaccompanied
Princeton subject headings:
Carols, German--Austria.
Carols.
Christmas music.
Songs.