The book is famous for Harris’s philosophical insights into music, known as "Eddieisms," which encourage players to see music as a language rather than a puzzle: "There are no wrong intervals if played in succession". "There are no wrong chords, only wrong progressions".

The reason musicians often search for a "patched" or compiled version of this concept is that Harris’s original materials were dense and required a specific

And when your friends ask what you’re practicing, smile and say: “It’s the Intervallistic Concept. Sorry, the PDF is patched. You can’t have my copy.”