Columbia subject headings:
Harmony.
Karg-Elert, Sigfrid, 1877-1933. Polaristische Klang- und Tonalitätslehre.
Musical intervals and scales.
Harvard subject headings:
Harmony.
Karg-Elert, Sigfrid, 1877-1933. Polaristische Klang- und Tonalitätslehre (Harmonologik)
Musical intervals and scales.
Tonality.
Princeton subject headings:
Harmony.
Karg-Elert, Sigfrid, 1877-1933--Written works.
Music--Acoustics and physics.