And any normal person would perceive this work of "art" as utter bull.
It would serve decently as a group experiment though. People obviously went to listen to the person play music so you could study the crowd's reaction. But that isn't art.
Oh I agree 100%, to me that's just a picture that ethic has posted, he's created it, but that's it. It's not art. Just as me picking up a guitar and banging it with a hammer isn't music.
Cage's 4'33" is a composition because it's been music because has a deliberate structure to it, there are a set amount of bars to the piece as notated sheet music, it's a movement in three parts, it involves a musician, it requires an instrument to be present. There is no melody of which to speak, there is no beat being kept by the instrument, but there is a time structure as made up by the ambient sounds of where it is heard, and there is volume, albeit "silence".