Understand the single idea the whole course is built on: your brain can only hold a handful of things in mind at once, so you learn to improvise by "chunking" knowledge into long-term memory and using slow, deliberate practice (System 2) to train fast, intuitive playing (System 1). You'll see why limitation exercises — drastically restricting your options — let you absorb more about each new skill while still leaving room to play musically.
This lesson’s section of the Course Guide.
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The human brain can only keep a handful of things in mind at once. This fundamental bottleneck in our working memory applies to every domain. However, even though we can only keep a few things actively in mind, the loophole is that, with practice, we can build up arbitrarily rich “chunks” that each take up only one “slot” in our working memory.
These chunks allow experienced players to operate intuitively using what psychologist Daniel Kahneman calls System 1 thinking—fast, pattern-based, and automatic—instead of the slower, deliberate System 2 mode that beginners rely on.
To build those rich chunks, we’ll use a strategy called limitation exercises. These exercises simplify the musical context (and the overall difficulty level of improvising) by restricting variables. For example, we might limit things to one chord (an E7 vamp), one scale (E minor pentatonic), and one small area of the fretboard using a single geometric pattern. This makes it easier to focus on the sound, feel, and musicality of the notes without overwhelming the brain’s limited processing capacity. The goal is to allow you to internalize fretboard knowledge and scale patterns through repetition in a controlled environment, gradually shifting your understanding from System 2 to System 1.
Whenever you feel overwhelmed by an exercise, that’s a signal to simplify things even more.
Discussion (3)
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It’s surprising that, when improvising over the same chord (a minor seventh), we can use two different scales: the minor pentatonic and the major scale. Of course, they consist of the same notes, but the "feel" is quite different. But works.
Furthermore, the trick of using small "bends" is brilliant—it finally makes sense of all those quarter-tone bends that I’ve seen in the great blues players over the years.
I’ve been playing for a long time, though without much formal structure; my fingers know how to phrase and "sing," but having this STACK, a clear view of the chord structure—and every individual note within the chord—is a huge help.
Perhaps my main question is: why start off with this kind of ambiguity—improvising using both a minor and a major scale over the same seventh chord? Why didn’t we begin by improvising using the minor pentatonic scale over Am, and the major pentatonic scale over A?
Or maybe start using de A7 with the Minor Pentatonic, and a Amaj7 with a Major Pentatonic.
Good questions, and your follow-up is close to where the course goes. Module 5 does exactly that: a major pentatonic over each major chord and a minor pentatonic over each minor chord, matched to the chord’s root.
Starting on a dominant seventh is on purpose. It’s the one everyday chord that both pentatonics fit. Over E7, E minor pentatonic gives you the bluesy sound: its flat seventh is in the chord, and its minor third rubs against the chord’s major third, which is what the little bend is for. E major pentatonic gives you the brighter sound, with its third matching the chord. Try the same swap over Em and the major pentatonic’s third clashes hard. Over Emaj7, the minor pentatonic has two clashing notes instead of one.
It also fits the limitation idea from this lesson. Hold the chord still and change only the scale, and you hear what the scale itself is doing. That’s 2-6, where you switch between the major and minor stacks over the same A7. Blues is also built almost entirely on dominant chords (Module 8 gets into that), so it’s the sound most players already have in their ears.
One small correction: E minor pentatonic and E major pentatonic share only two notes, the root and the fifth. The pairs that share all five are relative scales, like E minor pentatonic and G major pentatonic.
--Keith