Columbia subject headings:
Conductors (Music)
Gershwin, George, 1898-1937.
Marx, Harpo, 1888-1964.
Music--United States.
Musicians--Correspondence.
Harvard subject headings:
Conductors (Music)
Gershwin, George, 1898-1937
Marx, Harpo, 1888-1964.
Music--United States
Music--United States--History and criticism
Musicians--Biography
Musicians--Correspondence
Princeton subject headings:
Conductors (Music)
Gershwin, George, 1898-1937.
Levant, Oscar, 1906-1972.
Marx, Harpo, 1893-1964.