Columbia subject headings:
Harvard subject headings:
Igorʹ Svi͡atoslavich, novgorod-severskiĭ kni͡azʹ, 1151?-1202--Drama.
Operas--Vocal scores with piano
Princeton subject headings:
Arrangements (Music)
Igorʹ Svi︠a︡toslavich, novgorod-severskiĭ kni︠a︡zʹ, 1151?-1202--Drama.
Operas--Vocal scores with piano.
Operas.
Vocal scores.