Columbia subject headings:
I͡Avorskiĭ, B. L. (Boleslav Leopolʹdovich), 1877-1942.
Music.
Musicians--Biography.
Harvard subject headings:
I︠A︡vorskiĭ, B. L. (Boleslav Leopolʹdovich), 1877-1942.
Music--History and criticism
Musicians--Biography
Princeton subject headings:
Music.
Musicians--Biography.