Adding chromatic notes to a scale is easy; adding them without losing the sense of key is the real skill. This lesson tackles exactly that problem — showing you what happens rhythmically when you insert chromatic passing tones between adjacent scale degrees, and how to keep your strong scale tones landing on the beat every time.
What you’ll get out of this lesson: You’ll understand why chromatic notes create weak lines when they land on downbeats, and you’ll learn two practical rules — a chromatic enclosure method and Barry Harris’s upper diatonic neighbour approach — for keeping your scale tones on the beat while adding chromatic colour between them.
Why chromatic notes on downbeats sound wrong
A 2nd is the interval between any two adjacent scale degrees, and this lesson is about adding chromaticism between and around those neighbouring notes. The core problem with unguided chromaticism is this: if a note that doesn’t belong to the key lands on a downbeat — on beat one, two, three, or four — it sounds wrong. Not interestingly tense, just wrong. The listener hears it as a mistake because there’s nothing pulling it back into focus. To make chromatic notes work, you need scale tones on the downbeats and chromatic notes on the upbeats — the “and” of one, the “and” of two, and so on. That placement turns chromatic notes into passing tones that add colour without undermining the harmony.
The rule for scale degrees with a tone between them
When two adjacent scale degrees are a tone apart — a two-fret gap on the guitar — adding a chromatic passing tone is straightforward. Play the first scale degree on the downbeat, the chromatic note on the upbeat, and the next scale degree on the following downbeat. Scale tones stay on the beat and the chromatic note sits neatly in between. This is the foundation of the whole approach, and when you apply it to a whole scale you can hear how the line still sounds like the original key even though you’ve added all those extra notes.
The enclosure rule for semitone steps
The complication arises when two adjacent scale degrees are only a semitone apart — there’s no room for a chromatic note between them. If you simply play the two adjacent notes in a stream of eighth notes, one of your scale tones will inevitably fall on an upbeat, creating a weak moment. The fix is an enclosure: add an extra note to displace the line and push the next scale tone back onto a downbeat. When descending, add a note one semitone below the second scale degree; when ascending, enclose from one semitone above. The diagram below shows this in C major. Notice how in the second line (chromatic passing tones only) the green scale notes drift onto upbeats — and how the third line (with enclosures at the semitone steps) puts them firmly back on the beat.
“It sounds wrong when I play a note outside the key on a downbeat. That creates a weak line. It sounds like I don’t know the harmony, or I don’t know where I’m going — and that’s why we have to pay some attention when we want to imply chromatics.”
Barry Harris’s upper diatonic neighbour method
The chromatic enclosure works well, but Barry Harris developed a more musical solution. Whenever you come to two scale degrees a semitone apart, instead of adding a chromatic note from below, you step up to the next scale degree above and then return to your target note — a diatonic upper neighbour rather than a chromatic enclosure. Crucially, it’s always an upper neighbour regardless of whether the line is ascending or descending. This sounds noticeably more melodic than the chromatic version, because you’re staying inside the key at every point. The diagram below shows both methods side by side, with arrows marking exactly where they differ. Both approaches are worth learning and practising across every scale.
Taking it further: Once you can connect one scale degree to the next using both methods, try running the whole scale — connecting all the semitone steps and adding enclosures or upper neighbour tones as you go. Apply this to major, natural minor, and any modes you’re currently working on. Then start using these chromatic approaches to begin phrases: set up a strong arrival note with a chromatic run and build the rest of the line from there. As always, apply any idea you like to your own style; if something I play doesn’t suit you, focus on the underlying concept and adapt it.
Your homework: Take one scale shape you know well — any major or minor will do. Work slowly through it one scale degree at a time, identifying whether each step is a tone or a semitone. At each tone step, add a chromatic passing note. At each semitone step, add an enclosure using both the chromatic method and the Barry Harris upper-neighbour method. Repeat until the rule becomes automatic, then try it ascending and descending without stopping.