Composing for the prepared piano is not a criticism of the instrument. I'm only being practical.
John CageWe are living in a period in which many people have changed their mind about what the use of music is or could be for them. Something that doesn't speak or talk like a human being, that doesn't know its definition in the dictionary or its theory in the schools, that expresses itself simply by the fact of its vibrations. People paying attention to vibratory activity, not in reaction to a fixed ideal performance, but each time attentively to how it happens to be this time, not necessarily two times the same. A music that transports the listener to the moment where he is.
John CageAfter I had been studying with him for two years, Schoenberg said, ‘In order to write music, you must have a feeling for harmony.’ I explained to him that I had no feeling for harmony. He then said that I would always encounter an obstacle, that it would be as though I came to a wall through which I could not pass. I said, ‘In that case I will devote my life to beating my head against that wall.’
John Cage