The purpose of <i>4'33"</i> is to make you aware of the sound of your surroundings. Similarly, the last song on Boards of Canada's album <i>Geogaddi</i> is two minutes of silence, and every time I listen to that album I hear something new during that final song.

Cage was a very interesting musician, artist, and thinker. Some of his last works from the late 80s and early 90s (he died in August 1992) are absolutely breathtaking.