The Course
Fret Science: Complete Scale Fluency is built for guitarists who have been playing for a while but still feel like the fretboard is working against them. Maybe you know the pentatonic box. Maybe you've tried to learn modes. But the shapes don't connect, the fretboard feels bigger than it should, and every new scale you learn just adds to the pile of things you're supposed to remember. This course is different.
Instead of handing you more patterns to memorize, it gives you a small set of visual and conceptual tools that unlock the entire fretboard — tools that work for every scale you'll ever encounter. The pentatonic scales, the modes, harmonic minor, melodic minor, and more: they all live on the same fretboard, and this course shows you exactly how they fit together. You'll learn to see the geometry of the fretboard clearly, navigate horizontally and diagonally without getting lost, and understand why everything is positioned where it is. Once those tools click, scales stop feeling like a pile of shapes and start feeling like a language you actually speak.
The course is structured to build your understanding from the ground up — starting with the major scale as a reference system, moving through a complete mastery of the pentatonic scales across all positions and directions, and expanding outward through the full landscape of scales that matter. Every step is designed to reduce what you need to keep in your head so you can focus on playing something that sounds intentional.
No more memorizing shapes that don't add up to a fretboard. No more being stuck in the box — or hitting a ceiling when you try to go beyond it. Everything connects, and by the end, you'll have a unified framework for navigating scales, understanding modes, and making what you play actually sound like music.
It's the most systematic — and most freeing — way to finally own the fretboard.
What you will learn
When I designed this course, my goal was to build something genuinely comprehensive — not just another pentatonic course with a few modes tacked on at the end. Every module is sequenced deliberately, so that each new concept extends a foundation you've already built rather than asking you to start over. The pentatonic scales aren't a stepping stone you leave behind. They're the navigation system the whole course is built on.
By the end of this course, you'll be able to navigate the minor and major pentatonic scales across the entire fretboard — in position, diagonally, and horizontally — with total freedom of movement. You'll understand the major scale deeply enough to see how the modes emerge from it naturally, and you'll have a clear, visual system for playing all seven modes without memorizing seven separate shapes. You'll be able to extend that same framework to harmonic minor, melodic minor, and beyond — including Phrygian dominant, the altered scale, and other scales that serious players actually use. And you'll know how to turn all of it into music: how to build phrases, use melodic sequences, and make scales sound intentional instead of mechanical. One unified system. Every scale that matters.
Curriculum
This course is currently being rolled out -- with one new video lesson added every week. When it is complete in mid 2026, there will be 7 modules in total, comprising more than three hours of step-by-step, animated video lessons, plus a comprehensive printable PDF course reference guide.
See below for a list of upcoming lessons.
- 3-1 Why the minor pentatonic comes first (9:11)
- 3-2 The rectangle and stack - and the warp (7:18)
- 3-3 In-position pentatonics- Building blocks (6:22)
- 3-4 In-position pentatonics- Melodic sequences (6:01)
- 3-5 Diagonal penatonic pathways (6:05)
- 3-6 Horizontal pentatonic movement 1: Playing along one string (7:56)
- 3-7 Horizontal pentatonics movement 2: Two-string shapes and melodic sequences (9:37)
Upcoming Lessons
Module 3: Pentatonics -- Movement, Shape, and Freedom
- 3-6 Horizontal Pentatonic Movement 1- Playing Along One String (2026-03-21)
- 3-7 Horizontal Pentatonic Movement 2- Two-String Shapes and Melodic Sequences (2026-03-28)
- 3-8 The Major Pentatonic Scale- Same Shapes, New Anchors
- 3-9 Pentatonic variants- Expanding the framework
Module 4: Interlude
Two essential skills
- 4-1 Now's the time to learn the notes on the fretboard
- 4-2 Intervals, revisited
Module 5: The Major Scale Across the Fretboard
Apply your pentatonic navigation skills to the full seven-note world.
- Rectangle & stack applied to the major scale
- Modes as decorated pentatonics
- In-position major scale patterns (hidden in plain sight)
- Diagonal major scale movement
- One-string and two-string major scale navigation
- 3-note-per-string as a lens, not a cage
Module 6: Turning Scales into Music
Making everything you've learned actually sound intentional (we've been doing this all along, but here is why it works).
- What melodic sequences really are (and why they work)
- Interval algorithms: pattern + shift
- Groups of 3, 4, 5, and beyond
- Landing on a strong beat
- Rhythm, meter, and displacement (3 against 2, odd groupings)
- String skipping and contour
- Using repetition and variation musically
- Practicing scales so they stop sounding like exercises
Module 7: Harmony, Minor Scales, and Extensions
Expanding the system without breaking it.
- Diatonic harmony inside the major scale
- Triads and 7th chords embedded in scales
- Harmonic and melodic minor: what they change and why
- Phrygian dominant and real-world usage
- Other modes of harmonic/melodic minor
- Symmetric and “oddball” scales (whole-tone, altered, diminished)
- Gear shifts: moving between related scale families
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Your instructor
Hi, I'm Keith Martin. I've been playing guitar since the 1980s, and for a long time, scales felt like an endless accumulation of shapes I was supposed to memorize but never really understood. I learned patterns. I learned boxes. But the fretboard never felt like a coherent place — it felt like a collection of disconnected diagrams. It wasn't until I began drawing on my background as an MIT-trained computer scientist and applying principles from cognitive science that things finally clicked. I realized the problem wasn't my memory or my technique. It was that nobody had ever given me a clear mental model of how the fretboard actually works.
This course is the result of building that model from the ground up. Fret Science: Complete Scale Fluency distills the visual and conceptual framework I developed to finally make the fretboard make sense — across every scale that matters. It's the course I wish I had decades ago: one that replaces an ever-growing pile of patterns with a small set of tools that apply everywhere. I created it for guitarists who are smart, serious, and tired of feeling like the fretboard is bigger than they are. If that's you, I'd love to show you what it looks like when everything finally connects.
For more information, visit FretScience.com
At fretscience.com, you can find more information about all of my offerings, including free YouTube content and my growing Patreon community. I also invite you to sign up for my low-volume, spam-free newsletter.
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