Columbia subject headings:
Songs (High voice) with piano.
Songs (Medium voice) with piano.
Vocal duets with piano.
Harvard subject headings:
Songs (High voice) with piano.
Songs (Medium voice) with piano.
Vocal duets with piano.
Princeton subject headings:
Incidental music--Scores.
Incidental music.
Scores.
Songs (High voice) with piano.
Songs (Medium voice) with piano.
Songs.
Vocal duets with piano.