yeah, he has alot more than 4 minutes of work, of course anyone could have done 4:33 of silence,but cage is the guy who did it. whether or not it has any value it does at least bring attention to his other work.
and i don't think he's renowned more for his ideas than music, people who bring up 4'33 usually trash it, and the only reason it's his most famous work is because it allows people to talk shit about him without having to make the effort to just listen to some music
listening to the interview "it's made up, they weren't reading music" was the most interesting part, becuase as far as i'm aware cage was always saying that traffic and the like is music, and surely traffic noises are not read off sheet music, so i think he should like that kind of thing?
http://old.thing.net/ttreview/marrev.12.html
in the comments on this site someone says cage changed his mind about branca,any truth to that?