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, whereas Alan Hovhaness's Symphony No. 9, Saint Vartanâoriginally op. 80, changed to op. 180âcomposed in 1949â50, is in twenty-four.