http://www.hamburger-kunsthalle.de/index.php/john-cage-an-ear-alone-is-not-a-being/articles/Cage_Biographie.html
http://www.youtube.com/watch?v=JTEFKFiXSx4&feature=related
http://de.wikipedia.org/wiki/John_Cage
http://www.hamburger-kunsthalle.de/index.php/john-cage-an-ear-alone-is-not-a-being/articles/Cage_Biographie.html
http://www.youtube.com/watch?v=JTEFKFiXSx4&feature=related
http://de.wikipedia.org/wiki/John_Cage