Is Art art?

Art, which makes people feel impression

4minute 33second, which composed by John Cage. It doesn't have any melody, rhythm and the other musical elements. It just have only silence during 3minute 44second. Now, I'll talk about this work is art or isn't.
I believe 4minute 33second is art. Someone may think it isn't art and they'll say it doesn't have melody, rhythm, harmony and the others about music. However, "Music must have melody and rhythm." is just a fixed idea. Of course, music around us have melody, rhythm and harmony and we are used to listen these kind of music. As a result, most of people don't think this is not art. But, it's art.
I fist saw 4minute 33second on TV program 'Sponge' and when I first saw it, I thought it isnt' art. It didn't have any musical elements and I couldn't feel what the composer wanted to say. On the 'Sponge', a commentator helped our understanding and he said that "Composer wanted to make us listen natural's sound. During 4minute 33second, audiences couldn't listen the music, but they could listen outside's sound and their own sound for instance, children's noise or paper's rustling sound." After that, I recognized that is real art.
This work gives us the chance to listening sound around us. Even though this work doesn't have any melody or rhythm, I could say this is art with confidence. It moved my feeling and I think art is like this. Do not just listen music, please feel music with own mind.