Harris wanted musicians to practice manipulating intervals. For example, if you are playing a melody and the next note you hear in your head is a Perfect 5th away, you should be able to jump that 5th flawlessly, regardless of what key you are in or what scale the chord chart says you are supposed to be playing.
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He advises against predictable sequences. Instead, vary interval direction, skip sizes, and note lengths to maintain spontaneity. Harris wanted musicians to practice manipulating intervals
Extensive guides on expanding the range of the instrument into the highest registers. He advises against predictable sequences
: Exercises focusing on wide leaps and non-diatonic interval patterns to break away from standard scalar playing. Harmonic Expansion
The Intervallistic Concept remains a "musician's musician" text. It is not a "fake book" or a collection of licks. It is a rigorous technical method designed to give the improviser total command of their instrument. While difficult to work through, it is considered by many advanced saxophonists to be one of the most effective methods for achieving true virtuosity and breaking creative plateaus.