Core Points - The article highlights the historical significance of Xian Xinghai's application to join the Communist Party of China, reflecting his commitment to the party and the nation during the anti-Japanese war [2][3][4] - It details Xian Xinghai's contributions to Chinese music and his evolution from a patriot to a communist, emphasizing his role in creating influential anti-war songs and his collaboration on the monumental "Yellow River Cantata" [3][4] Group 1 - Xian Xinghai submitted his application to join the Communist Party on May 15, 1939, expressing his desire for political guidance and his commitment to contribute to the party's strength in the new China [2] - He was a pioneer of new Chinese music, known as the "People's Musician," and actively participated in the anti-Japanese movement by creating significant songs [3] - His application was influenced by his interactions with Zhao Yimin, who encouraged him to develop his talents and embrace communist ideals [3] Group 2 - Xian Xinghai officially joined the Communist Party on June 14, 1939, marking it as the most glorious day of his life and expressing his hope to change his worldview to fight for proletarian music [4]