[qnpnp]

Well you seem to be confusing "what is good art" and "what is art". I vehemently disagree with saying 4:33 or the banana "isn't art", this sounds like a very narrow definition which I struggle to imagine.

I have more sympathy for the claim that it's not "good art", not particularly interesting or meaningful.

With regard to the banana I tend to agree. This was just a small provocating artpiece which doesn't bring anything to the table and is unlikely to be discussed much in ten years, let alone 70.

4:33 however is still very much discussed 70 years later and will continue to be, and that may be because it's not just a random joke but fits within the work of an important composer (John Cage) which contributed significantly to the artistic debate of what "is" music, at a time where this question was suddenly much less clear than it had been in the past (i.e. the same piece today would be much less meaningful).