The concepts in this collection were inspired by the Equal Interval System (EIS) created by arranger/composer Lyle Spud Murphy. His goal was to create an atonal method for composition based on the naturally occurring overtone series. Essentially, these studies in "musical mathematics" can teach you how to write free horizontal lines. Fellow guitarist, Terry Thompson asked me to write out some lines that could be applied within the context of musical improvisation. Terry and I developed this process over quite some time and have amassed a rather large amount of material that is now being presented to you in this lesson book. We hope that you can apply these chromatic ideas within your solos, intros, turnarounds, cadenzas, interludes, and other musical expressions.