http://musiced.about.com/od/20thcentury/p/cage.htm
http://en.wikipedia.org/wiki/John_Cage
_ 表現(Hyogen) / 『 4'33" 』John Milton Cage Jr.
http://youtu.be/8cXXTe7mtbo
_ John Cage: Music of Changes - Book I
http://youtu.be/qOwcpjr9wFA
_ John Cage: Thirteen Harmonies (1985)
http://youtu.be/BowyUXyNud4