Sergei Sergeyevich Prokofiev was a Russian composer, pianist and conductor. As the creator of acknowledged masterpieces across numerous musical genres, he is regarded as one of the major composers of the 20th century. His works include five piano concertos, nine completed piano sonatas and seven symphonies, and such widely heard works as the March from The Love for Three Oranges, the suite Lieutenant Kije, the ballet Romeo and Juliet – from which "Dance of the Knights" is taken – and Peter and the Wolf.