The 20th century saw further diversification in the style and content of works that composers labeled "symphonies". Some composers, including Dmitri Shostakovich, Sergei Rachmaninoff, and Carl Nielsen, continued to write in the traditional four-movement form, while other composers took different approaches: Jean Sibelius' Symphony No. 7, his last, is in one movement, Richard Strauss' Alpine Symphony, in one movement, split into twenty-two parts, detailing an eleven hour hike through the mountains and Alan Hovhaness's Symphony No. 9, "Saint Vartan"—originally op. 80, changed to op. 180—composed in 1949–50, is in twenty-four.