Final answer:
Igor Stravinsky was the first Russian composer whose operas were recognized as being equal to those of his Western contemporaries. His ballet, The Rite of Spring, was particularly influential.
Step-by-step explanation:
Igor Stravinsky was the first Russian composer whose operas were sung throughout and who was recognized as being equal to those of his Western contemporaries.
Stravinsky was a prominent modernist composer best known for his ballet, The Rite of Spring, which scandalized audiences at the time. His music pushed the boundaries of acceptable conventions, challenging the audiences of his day.