Kaydia Many students make the mistake of thinking that the fingers control the music and they wait for the piano to produce that gorgeous sound. This will result in a flat performance and unpredictable results. The music must originate in the mind and the pianist must coax the piano to produce what s/he wants. This is mental play, introduced above; if you had never practiced mental play before, you will find that it requires a level of memorization that you had never achieved before β but that is exactly what is needed for flawless, authoritative performances. Fortunately, mental play is only a few steps beyond the memorization procedures in this book, but it accomplishes a giant leap in your musical capabilities, not only for technique and making music, but also for learning absolute pitch, composing, and every aspect of piano playing. Thus technique, music, and mental play are inseparably intertwined. Once you are deeply involved with mental play, you will discover that it doesnβt really work without absolute pitch. These discussions provide a firm basis for identifying the skills we need to learn. This book provides the practice methods needed to learn them.
This is kind of true. Basically, he's talking about pitch memory. At an advanced level, it is when someone can recall, say, the opening note of Fur Elise, and figure out the other notes using relative pitch. I have experienced this on occasion but have never managed to be consistent with it. I know several people without perfect pitch who can do this.