Columbia subject headings:
Harvard subject headings:
Harmony of the spheres.
Hindemith, Paul, 1895-1963.
Kayser, Hans, 1891-1964.
Musicians--Biography
Musicians--Correspondence
Musicians--Correspondence, reminiscences, etc.
Princeton subject headings:
Harmony of the spheres.
Hindemith, Paul, 1895-1963.
Kayser, Hans, 1891-1964.
Musicians--Correspondence, reminiscences, etc.