Columbia subject headings:
Avant-garde (Music)--Italy--Rome--History--20th century.
Improvisation (Music)--History--20th century.
Harvard subject headings:
Avant-garde (Music)--Italy--Rome--History--20th century.
Improvisation (Music)--History--20th century.
Princeton subject headings:
Avant-garde (Music)--Italy--Rome--History--20th century.
Improvisation (Music)--History--20th century.