Sergei Sergeyevich Prokofiev was a Russian composer, pianist, and conductor from the Soviet Union. He is recognized as one of the twentieth century's great composers, having produced accepted masterpieces in several musical genres. The March from The Passion for Three Oranges, the suite Lieutenant Kijé, the ballet Romeo and Juliet—from which "Dance of the Knights" is taken—and Peter and the Wolf are among his most well-known compositions. He wrote seven completed operas, seven symphonies, eight ballets, five piano concertos, two violin concertos, a cello concerto, a symphony-concerto for cello, and orchestra nine completed piano sonatas among the established styles and genres in which he played.