Says logic. If I say the sky is pink, does that make it pink? Pink by my deffinition maybe, which may be analogus to your deffintion of blue, but either way, we are talking about the same thing, just with diffrent deffinitions.
The sky is blue, (by common deffintion) that is fact, and the sky is not pink.
The issue is simply in our deffintion of music, does ambient noise count as music? I certianly don't think so, but John Cage did...
Is a blank canvas art, what about a blank notebook, is this literature?
Now, just for the record, I do think that most of John Cage's works are music, a lot it of it may be stretching the deffinition, but it is music never the less, 4'33 however, in my opinion, isn't music.