Columbia subject headings:
Aleatory music.
Songs (High voice) with unspecified instrument.
Songs (High voice), Unaccompanied.
Zodiac--Songs and music.
Harvard subject headings:
Aleatory music.
Song cycles.
Songs (High voice)
Songs (High voice), Unaccompanied.
Zodiac--Songs and music
Princeton subject headings:
Aleatory music.
Songs (High voice) with unspecified instrument.
Songs (High voice), Unaccompanied.
Songs.
Zodiac--Songs and music.