He actually does discuss Shepard Tones and the Shepard Scale in the book, and explains how he thinks they are related to Bach's compositions.
Near the end of chapter 20, there is an example of a harmony that, when looped, creates the illusion of an endlessly rising melody.
In this harmony, the loudness of each note in the melodies rises and falls so that the lower melodies feed into the the higher melodies and ultimately fade out. In our brains, we hear this as an endlessly rising melody.
Near the end of chapter 20, there is an example of a harmony that, when looped, creates the illusion of an endlessly rising melody.
In this harmony, the loudness of each note in the melodies rises and falls so that the lower melodies feed into the the higher melodies and ultimately fade out. In our brains, we hear this as an endlessly rising melody.