Sergei Prokofiev was a Russian composer, pianist, and conductor. As the creator of masterworks across numerous music genres, he is regarded as one of the major composers of the 20th century. His works include The Love for Three Oranges, the suite Lieutenant Kijé, the ballet Romeo and Juliet and Peter and the Wolf. Of the established forms and genres in which he worked, he created seven completed operas, seven symphonies, eight ballets, five piano concertos, two violin concertos, a cello concerto, a symphony-concerto for cello and orchestra, and nine completed piano sonatas. After the Revolution of 1917, Prokofiev left Russia and settled in the United States, then Germany, then Paris, making his living as a composer, pianist and conductor. In 1936, Prokofiev and his family settled permanently in Moscow, after shifting back and forth between Moscow and Paris for the previous four years. From the late 1940s until his death in 1953, his life was a constant battle with the Russian bureaucracy, which was bent on diminishing his influence.