for several years Stravinsky's attitude toward me was critical." In March 1922, Prokofiev moved with his mother to the town of Ettal in the Bavarian Alps, where for over a year he concentrated on an opera project, The Fiery Angel, based on the novel by Valery Bryusov. His later music had acquired a following in Russia, and he received invitations to return there, but decided to stay in Europe. In 1923, Prokofiev married the Spanish singer Carolina Codina (1897–1989, stage name Lina Llubera) before moving back to Paris. In Paris, several of his works, including the Second Symphony, were performed, but their reception was lukewarm and Prokofiev sensed that he "was evidently no longer a sensation". Still, the Symphony appeared to prompt Diaghilev to commission Le pas d'acier (The Steel Step), a "modernist" ballet score intended to portray the industrialisation of the Soviet Union. It was enthusiastically received by Parisian audiences and critics. Around 1924, Prokofiev was introduced to Christian Science. He began to practice its teachings, which he believed to be beneficial to his health and to his fiery temperament and to which he remained faithful for the rest of his life, according to biographer Simon Morrison. Prokofiev and Stravinsky restored their friendship, though Prokofiev particularly disliked Stravinsky's "stylization of Bach" in such recent works as the Octet and the Concerto for Piano and Wind Instruments. For his part, Stravinsky described Prokofiev as the greatest Russian composer of his day, after himself. First visits to the Soviet Union Prokofiev met Boris Krasin in the violinist Joseph Szigeti's Paris apartment in 1924. In 1927, Prokofiev made his first concert tour in the Soviet Union. Over more than two months, he spent time in Moscow and Leningrad (as St Petersburg had been renamed), where he enjoyed a very successful staging of The Love for Three Oranges in the Mariinsky Theatre. In 1928, Prokofiev completed his Third Symphony, which was broadly based on his unperformed opera The Fiery Angel. The conductor Serge Koussevitzky characterized the Third as "the greatest symphony since Tchaikovsky's Sixth". In the meantime, however, Prokofiev, under the influence of the teachings of Christian Science, had turned against the expressionist style and the subject matter of The Fiery Angel. He now preferred what he called a "new simplicity", which he believed more sincere than the "contrivances and complexities" of so much modern music of the 1920s. During 1928–29, Prokofiev composed