Yan'an Years Introduction: After the "July 7th Incident" in 1937, Zheng Lucheng met Xian Xinghai and cooperated with him for a long time, producing film songs and recording records. In October of the same year, Zheng Lucheng rushed to Yan'an with full enthusiasm and studied in the music department of Shaanbei Public School and Lu Xun Art Institute. In 1938, Zheng Lucheng served as music director of the Chinese People's Anti-Japanese Military and Political University and vocal teacher of Lu Xun Art Institute. Later, he composed a large number of revolutionary songs such as "Ode to Yan'an", "Yanshui Ballad", "Defend Wuhan", "Production Ballad", "Message to Alang", "March of the October Revolution", "March of the Eighth Route Army", etc.