Search “which guitar scale system should I learn” and you’ll find a hundred articles arguing that their system is the correct one and every other system is a trap designed to keep you mediocre. I’ve written a few of those articles myself, if I’m honest. CAGED has real problems. So does 3NPS, in its own way. But “which one is correct” is the wrong question, and answering it that way is exactly why guitarists end up paralysed, switching systems every few months without getting fluent in any of them.
The right question is: what problem are you actually trying to solve? Different systems solve different problems. Once you know which problem is yours, the choice mostly makes itself.
The two questions that actually matter
Before picking anything, answer these honestly:
How many patterns are you willing to learn before you get useful results? Some systems ask for a lot up front and pay it back with completeness. Others deliberately trade some completeness for speed, so you’re playing sooner. Neither is wrong — they’re just different bets.
Do you want maximum scale variety, or fluency with a smaller set? Some players want fifteen exotic scales to draw from. Others want three or four scales they can play anywhere on the neck without thinking. These are genuinely different goals, and most scale systems only serve one of them well.
If you want the fewest patterns possible
Standard systems like CAGED and 3NPS ask you to learn five to seven positions before you have full neck coverage. That’s a lot of woodshedding before anything feels musical, and it’s the single biggest reason people give up on scales entirely.
The 2 Position Guitar Scale System: Scales and Arpeggios exists specifically to cut that down. Two positions per key, not five or seven — roughly 80% less to memorise before you’re covering the whole neck, plus arpeggios built into the same framework. If your priority is getting to “I can actually play this” as fast as possible, this is the starting point.
If you want serious depth and a large scale vocabulary
Some players aren’t looking for the minimum — they want a comprehensive reference they’ll come back to for years. If that’s you, the Woodshedder’s Guide to Guitar Scales is built for exactly that: a wide range of scales across the full fretboard, all built from three master patterns so a large vocabulary stays genuinely manageable instead of turning into hundreds of disconnected shapes.
If you want a structured, long-term practice method
The Scale Fluency series isn’t about learning new scales at all — it’s a practice method for getting genuinely fluent with scales you already know, one- and two-octave patterns practiced both vertically and horizontally until you can solo in any key without thinking about shapes. There’s a book for pentatonics, one for major scale modes, and one each for harmonic and melodic minor. This is the right pick if your scales are technically “known” but don’t yet come out fluently when you’re actually playing.
If you specifically want modes
Modes are their own category of confusing, and most guitarists who study them hit the same wall: they understand the theory but can’t make it work on the fretboard. Two books split that problem in two. Quickstart Guides: Modes covers the theory side concisely — what you actually need to know, no more. Major Scale Modes Designed for the Guitar handles the other half: a visual, fretboard-first method for playing any mode from any root, anywhere on the neck. Most people need both, in that order.
If you want to try 3NPS without committing to a book
Three-note-per-string scales are popular for a reason — even spacing, predictable technique, a natural fit for fast playing. If you want to test the waters before deciding it’s your system, the free 3NPS Scales PDF is a no-sign-up starting point.
If shred technique is the actual goal
This one’s different from the rest — it’s not really about learning scales at all. Shred Guitar Mechanics uses four-note-per-string patterns as a vehicle for building genuine four-finger independence in your fretting hand, the specific thing that separates players like Holdsworth and Shawn Lane from guitarists who are merely fast. If your fourth finger is doing less work than the other three, this is the one that actually addresses it.
There’s no single correct answer
If you came here hoping I’d just tell you “learn this one, ignore the rest,” I understand the appeal, but it wouldn’t be honest. A beginner trying to get their first full octave under their fingers and a working guitarist chasing genuine modal fluency are not solving the same problem, and a system built for one will frustrate the other. Match the system to what you’re actually trying to fix, not to whichever one you saw recommended most often, and you’ll get further with any of them.