Columbia subject headings:
Krenek, Ernst, 1900-1991--Criticism and interpretation.
Twelve-tone system.
Harvard subject headings:
Krenek, Ernst, 1900-1991--Criticism and interpretation.
Second Viennese school (Group of composers)
Twelve-tone system.
Princeton subject headings:
Krenek, Ernst, 1900---Criticism and interpretation.
Twelve-tone system.