Columbia subject headings:
Stockhausen, Karlheinz, 1928-2007.
Harvard subject headings:
Aleatory music.
Electronic music.
Heissenbüttel, Helmut, 1921-1996. Einfache grammatische Meditationen.
Stockhausen, Karlheinz, 1928-2007
Princeton subject headings:
Stockhausen, Karlheinz, 1928-2007.