“Formerly, silence was the time lapse between sounds, useful towards a variety of ends, among them that of tasteful arrangement, where by separating two sounds or two groups of sounds their differences or relationships might receive emphasis; or that of expressivity, where silences in a musical discourse might provide pause or punctuation; or again, that of architecture, where the introduction or interruption of silence might give definition either to a predetermined structure or to an organically developing one. Where none of these or other goals are present, silence becomes something else – not silence at all, but sounds, the ambient sounds. The nature of these is unpredictable and changing. These sounds (which are called silence only because they do not form part of a musical intention) may be depended upon to exist. The world teems with them, and is, in fact, at no point free of them” – John Cage (from page 22 of Silence: Lectures and Writings)
See Also: John Cage in the kitchen; 27 sounds and diet advice
Anyone know where to find the John Cage interview in which the length of his answers are determined by a random value computer program?