of Korean ceremonial music as well as imitations of the East Asian mouth organ saenghwang (Korean), sheng (Chinese) or shō (Japanese) into Western avant-garde music. Kidnapping From October 1959, Yun had been living in Krefeld, Freiburg im Breisgau and Cologne. With a grant from the Ford Foundation, he and his family settled in West Berlin in 1964. However, due to alleged acts of espionage, he was kidnapped by the South Korean secret service from West Berlin on 17 June 1967. Via Bonn he was taken to Seoul. In prison he was tortured, attempted suicide, forced to confess to espionage, threatened with the death sentence – and in the first instance sentenced to life imprisonment. A worldwide petition led by Guenter Freudenberg and Francis Travis was presented to the South Korean government, signed by approximately 200 artists, including Luigi Dallapiccola, Hans Werner Henze, Heinz Holliger, Mauricio Kagel, Herbert von Karajan, Joseph Keilberth, Otto Klemperer, György Ligeti, Arne Mellnäs, Per Nørgård, Karlheinz Stockhausen, Igor Stravinsky, and Bernd Alois Zimmermann. Yun was released on 23 February 1969, returning to West Berlin at the end of March. In 1971, he obtained German citizenship. He never returned to South Korea. From 1973 he began participating in the call for the democratization of South Korea and the reunification of the divided country. Teaching Yun taught composition at the Hochschule für Musik, Theater und Medien Hannover (1969–71) and at the Hochschule der Künste in West Berlin (1977–85). Among his students are Kazuhisa Akita, Jolyon Brettingham Smith, In-Chan Choe, Conrado del Rosario, Raymond Deane, Francisco F. Feliciano, Masanori Fujita, Keith Gifford, Holger Groschopp, Toshio Hosokawa, Sukhi Kang, Chung-Gil Kim, Wolfgang Klingt, Erwin Koch-Raphael, Isao Matsushita, Masahiro Miwa, Hwang-Long Pan, Martin Christoph Redel, Byong-Dong Paik, Bernfried Pröve, Takehito Shimazu, Minako Tanahashi, Masaru Tanaka, Michail Travlos, Jürgen Voigt. After 1979 Yun returned several times to North Korea to introduce new Western composition techniques as well as his own music. In 1982, the first Isang Yun Festival took place in Pyongyang. In 1984, the Isang Yun Music Institute opened in Pyongyang, North Korea. An ensemble had been founded there under his name. Yun promoted the idea of a joint concert featuring musicians from both Koreas in Panmunjom, which failed in 1988, but South Korean artists could be invited to Pyongyang in 1990. Later life and death Two concerts with works of Isang Yun had been performed in Seoul (1982) by Heinz