This dissertation introduces a Korean composer, Isang Yun (1917-1995), who embraced European traditions but retained Asian characteristics in his compositions. Attending the 1958 summer course in Darmstadt in Germany, Yun was strongly influenced by the avant-garde style of Boulez, Stockhausen, Nono, and Cage. In addition to his work as a composer, Yun distinguished himself, as one of the most important Asian composers to blend Eastern and Western music; and although his musical training focused on Western music, he continued the pursuit of Eastern sounds and philosophies throughout his musical life. Imprisoned in 1967 by the South Korean government, Isang Yun's music, particularly in later life, incorporates his beliefs on social and political issues together with musical ideas. Although his love of country was deep, Isang Yun was not allowed to return to South Korea, and he lived in Germany for the remainder of his professional life. In this study, my purpose is to investigate the development of Yun's musical ideas from his acceptance of Taoism four structures in the world: the Tao, heaven, earth, and man. The presence of both Western and Eastern influences in Yun's music provides the basic of his musical style, and analysis of Salomo für Altoflöte oder Flöte is included in this dissertation.