Columbia subject headings:
Aleatory music.
Bussotti, Sylvano--Manuscripts--Facsimiles.
Music--Manuscripts--Facsimiles.
Piano music.
Harvard subject headings:
Art music.
Bussotti, Sylvano--Manuscripts--Facsimiles.
Music--Manuscripts--Facsimiles.
Piano music.
Scores.
Princeton subject headings:
Piano music.