In plain words
Run a dominant scale down from its tonic in even eighth notes and, with nothing added, the sixth and then the fourth land on the beats. Barry’s usual fix was one extra note between the tonic and the flat seventh. With it, the tonic, seventh, fifth and third take the beats and the line comes out right. In general, he said, the added half step goes with a note that falls on the beat.
The 1998 workshop, part 114:4115:1715:49Half-step rules on the dominant scale, part 20:37Vera Marijt (research coach Jarmo Hoogendijk), Barry Harris: Exploring the Diminished (MA research paper) ¶186
Barry was plain about why the notes are there: so that we can practise rhythm. Running a scale this way is more than scale practice; you are practising rhythm and feeling what you are doing as the line comes down.
Half-step rules on the dominant scale, part 24:075:22The 1998 workshop, part 116:22
The rules matter more than the scale, and Barry wanted them to become second nature, so that you feel where a note is needed instead of being told. When a student’s run began to go wrong and he straightened it out without thinking, Barry said that proved his point. He went further: soloing comes down to putting a half step in at the right time and in the right place.
The 1998 workshop, part 2: breaking the habit0:34The 1998 workshop, part 335:23The 1998 workshop, part 120:0220:3828:3330:19
Every added note shifts the notes after it, so the next one belongs somewhere else; Barry had the class work out each new spot in turn. He also moved the single added note around, between six and five for instance, and the run still came out in time. And it need not be a half step: any note can go in between, which is why he thought it should be called something else.
The 1998 workshop, part 118:0419:16The half-step rules0:321:052:15The 1998 workshop, part 2: breaking the habit1:42
Step by step
Run the scale down from the tonic in even eighths, starting on the beat, with nothing added. The sixth, the fourth and the second fall on the beats, and the low tonic arrives off the beat.
B♭7 down, nothing added- B♭
- A♭
- G
- F
- E♭
- D
- C
- B♭
Add one note between the tonic and the flat seventh. The octave now takes eight eighth notes, and the tonic, ♭7, 5, 3 and the low tonic land on the beats.
B♭7 down, one added note- B♭
- A
- A♭
- G
- F
- E♭
- D
- C
- B♭
Half-step rules on the dominant scale, part 20:37The 1998 workshop, part 114:41Vera Marijt (research coach Jarmo Hoogendijk), Barry Harris: Exploring the Diminished (MA research paper) ¶186
As you go, ask which note will land on the next beat. Each note you add moves the ones after it, so the next added note, if one is needed, goes in a different place.
an added note, outside the scale
How he said to practise it
Practise putting the half steps in until you can pick the spots yourself, because you feel the line needs them, not because someone told you where they go.
Learn the rules for each kind of scale and run every scale through every rule; Barry reckoned the whole round would take no more than about fifteen minutes.
Write the rules down so you know what to practise, then practise them rhythmically, in time, not just as notes.
Half-step rules on the dominant scale, part 12:52
In Barry’s words
Each one plays from the moment he says it. Every other moment he teaches it is listed below.
The only reason we put these half step[s] in [is] so that we can practice rhythm.
You’re doing more than just practicing a scale. You’re practicing a rhythm.
You got to feel stuff so that, you know, oh, I have to do it. Not because somebody told you where to put a [half step], because you know, that’s what you have to do.
If you’re going to be a soloist, that’s all there is. You got to put a half step in at the right time with the right place.
Where this comes from
Everything above is drawn from these. Open any one to check it.
Every moment he teaches it12 moments in 5 recordings
Each time opens the transcript there; the video plays when you are online.
Half-step rules on the dominant scale, part 2
- 5:22
Says the added half steps are only there for rhythm practice; the rules assume starting on the beat.
The 1998 workshop, part 1
- 14:41
Rules matter: practise putting half steps in to choose the spots; they go with the note on the beat.
- 15:17
Runs B7 down and asks which number lands on the next beat in the plain scale: the six.
- 16:22
Tells the class this is more than practising a scale: they are practising rhythm.
- 18:04
Walks the class through where the next half step goes once one has been added.
- 20:02
A student rescues a run by instinct; Barry says it proves his point about feeling where the note goes.
- 28:33
Soloing is putting a half step in at the right time and place; runs down from the piano’s top.
- 33:36
From the third of B♭7, plays the run with and without the half step to show the difference.
The 1998 workshop, part 3
- 35:55
Rules matter more than the scale; A♭ major run straight down sounds empty until a half step goes in.
The 1998 workshop, part 2: breaking the habit
The half-step rules
- 0:32
Says people ask why he adds half steps; they could go anywhere, and a student moves the single one.
From the lessons3 lessons, 10 points
Notes taken from Barry’s classes, each tied to the moment it comes from.
Why add a half step: putting the right note on the beat
- Idea
Practise putting half steps into scales so you can pick for yourself the spots where they go; generally, Barry said, the half steps go with a note that falls on the beat. He walked through it on a dominant scale run down from its root, where he generally puts a half step between the tonic and the seventh. If you just think of the plain scale, ask which number lands on the next beat. It is the sixth, so the half step goes between six and five. Further down, the fourth lands on a beat, so something has to go between four and three.
- Exercise
Each half step you insert shifts which notes land on the beat, so the next one belongs somewhere other than where it would have gone. Barry had the class work out each new spot in turn: first between the tonic and seventh, then between the five and four. He added that even when you go wrong, a half step put in somewhere can make the line come out right, and played a run with and without one to show it.
- Idea
When a student’s run started to go wrong and he straightened it out without thinking about a half step, Barry said this proved his point: the student knew an extra note was needed to make the line come out right. You should put a half step in because you feel it is needed, not because someone told you where it goes.
Starting off the beat, or with pickups
- Idea
Barry said these half steps are put in so that we can practise rhythm. The rules assume you start on the beat, on ‘one’. If you start on the ‘and’ of the beat, you apply the opposite rule: start the tonic off the beat and you use no half step; start the second off the beat and you use one.
Half-step rules on the dominant scale, part 25:22
- Exercise
When a dominant-scale line starts with pickup notes, use the rule for whichever scale note lands on the beat. Go from the tonic to the third and then run down in eighths, and the second lands on the beat, so follow the rule for the second: no half steps. For a triplet start, generally follow the rule for the triplet’s second note: a triplet on the third and fourth takes the fourth’s rule (no half steps); one on the second and third takes one half step. A triplet on the tonic and second is the awkward case: Barry called it an exception, at first giving it one half step because the seventh then lands on the beat, and later saying no half steps.
Half-step rules on the dominant scale, part 10:000:321:452:17
- Exercise
Barry called this really important. Run the C7 scale down to the third, A. Started on the beat, it comes out perfectly. Started on the ‘and’ of the beat, you have to put in a triplet on F and G. Play straight eighths and use the triplet only at the one spot where it is needed; you have to feel when. Another way: start on F, run up to C (which becomes the tonic of C7), and put a half step between the tonic and seventh as you come down; done that way, the line went straight down.
Surrounding notes and the well-placed half step
- Idea
- Exercise
Learn surrounding notes: approach a target from the notes on either side of it. Barry’s example is the fifth of A flat, E flat, surrounded by E and D. In another demonstration he said he already had half of the surrounding notes, so all he had to add was the C and the C sharp.
The 1998 workshop, part 317:33The 1998 workshop, part 113:58
- Idea
Barry sums up music, and soloing above all, as putting a half step in at the right time and place. He can start at the top of the piano, run down and add half steps to fit any song, such as I Got Rhythm or All God’s Children. Whatever you do, a half step has to go in somewhere to make the line come out right.
- Idea
Barry has found that audiences react most to diminished notes, because against the harmony they sound wrong and ears respond to wrongness. His advice: throw a little wrong into the line, then make it right. Listeners don’t know what to think, but you have their attention.
Let the body do it2:18
In writing7 notes
What his interviews, his students’ class notes and other teachers’ articles add.
Barry’s added notes exist to put the chord’s important notes on the downbeats. On C7, one extra note between the root and the flat seventh puts C, B♭, G, E and C on the downbeats; any extra note will do, she adds, as long as that happens.
Vera Marijt (research coach Jarmo Hoogendijk), Barry Harris: Exploring the Diminished (MA research paper) ¶186Vera Marijt (research coach Jarmo Hoogendijk), Barry Harris: Exploring the Diminished (MA research paper) ¶187
A player who transcribed Barry’s remarks from the first Workshop Video quotes him saying the half steps only keep you rhythmically in tune: on a dominant the single one could just as well go between 6 and 5 or 2 and 1, and it need not be these particular half steps.
jazzguitar.be members (usernames kept per post), Official Barry Harris Thread (jazzguitar.be forum thread) ¶1691jazzguitar.be members (usernames kept per post), Official Barry Harris Thread (jazzguitar.be forum thread) ¶1692
The workbook to Barry’s Workshop Video, Part 1 names this the ‘Harris Half-Step Practice Model’ and sets it out before the separate dominant, major and minor rules.
Barry Harris (on video); Howard Rees (producer, The Barry Harris Workshop Video ¶15
A member who taped Barry’s small West Coast workshops in the early 1990s says Barry stressed these rules, and that their aim is to build a feel for steering a scale line so its chord tones keep landing on the beat.
jazzguitar.be members (usernames kept per post), Barry Harris’s opinion of harmonic minor scale? ¶40
Tom Cleary hears the root-to-flat-seventh half step in solos by Ray Vega (‘Sister Sadie’) and Miles Davis (‘So What’, Stockholm 1960), used the bebop way: a passing note on the upbeat inside eighth-note scale runs.
Tom Cleary (University of Vermont), One half step of separation: Miles Davis and Ray Vega ¶9Tom Cleary (University of Vermont), One half step of separation: Miles Davis and Ray Vega ¶11
Checking his transcriptions and records after learning the rules, one player found the added half steps really are there, but seldom for more than an octave; longer runs began to sound dull.
One forum member sees the rules as practice-room work: they put the sound and the mechanics of the style into your ear and hands, but are not something to think about on the bandstand.
jazzguitar.be members (usernames kept per post), The Barry Harris Half-Step Practice Model (jazzguitar.be forum thread) ¶84jazzguitar.be members (usernames kept per post), The Barry Harris Half-Step Practice Model (jazzguitar.be forum thread) ¶85
How other teachers explain it5 videos, 26 series episodes
Barry’s students, and their students, teaching it their way. A second opinion, not Barry.
- How to Apply the “Rules” to Build Lines
Building lines: run up a chord of the C7 scale from a half step below, then come down by the rule for its top note.
5 min, transcript On YouTube
- Scale Phrases for F Major Blues
Adds the extra-note rules to the scales of an F blues; why he says ‘extra note’ rather than ‘half step’.
11 min, transcript On YouTube
- Using Extra Note Rules for Improvisation
6 min, transcript On YouTube
- Why Barry Harris’ Approach Is So Much Better Than Bebop Scales!
Compares Barry’s approach with bebop scales.
11 min On YouTube
- The Barry Harris Rule That Makes Scales Sound Like Real Jazz
11 min On YouTube
In the teaching series
Episodes on this idea in the long series by other teachers. Each name opens that whole series in order.
Things I’ve Learned From Barry Harris
- Episode 5: half-step rules on F7 YouTube
- Episode 25: major scale half-step rules YouTube
- Episode 54: there is no such thing as a bebop scale YouTube
- Episode 83: Barry’s half-step rules continued YouTube
- Episode 99: a new “bebop” scale YouTube
- Episode 116: let’s practise together YouTube
- Episode 133: do you know your half-step rules? YouTube
Where the accounts differ1 point
A forum member comparing Barry with David Baker reads Barry as caring mainly that a line lands on a chord tone, where Baker wants chord tones on as many downbeats as possible. Barry’s own explanation ties the added note to the notes that fall on the beat, though in drills he also moved it freely.
The 1998 workshop, part 114:41The half-step rules0:32jazzguitar.be members (usernames kept per post), David Baker Bebop Scales — Barry Harris half-steps ¶6
Read further6 links
These open on the web.
Free to read
- researchcatalogue.net
— Vera Marijt’s free research exposition, with transcribed examples showing the extra note putting the chord’s important notes on the downbeats.
Books and paid courses
- Frederic Galliano, Notes on the Method of Barry Harris (HTML + PDF, updated Jan 2026): scale exercises, chromatic scale, Parker ideas, families, 4 chord scales, moving in fourths, 5-4-3-2, half-step tables, important arpeggios, scale outlines of blues/rhythm/Cherokee/Donna Lee/How High the Moon/Night in Tunisia
attendee-of-videos notes (from Chris Parks’ TILF + Labyrinth + Kingstone) — Free notes with tables of where the added notes go for dominant, major and harmonic minor scales, framed as putting chord tones on the beats.
- jazzguitar.be ‘David Baker bebop scales vs Barry Harris half steps’
players — Players compare Barry’s added notes with David Baker’s bebop scales and what each does to the downbeats.
- jazzguitar.be Official Barry Harris thread, post #21 (joe2758, 14 Oct 2016): attendee-style outline of the ‘ABCs’ on Rees DVD 1 (important minor ignored for soloing; scale up and down tonic-to-7th; thirds, thirds with half step below, triads, triads with pickup, 4-note chords, chords with pickup; 3 important arpeggios in all inversions; pivoting)
player summarising Barry’s DVD — Forum outline of the ‘ABCs’ on Barry’s workshop DVD, including the half-step practice model in context.
- Paul Berliner, Thinking in Jazz (Univ. of Chicago Press, 1994): section ‘The Harris Half-Step Practice Model’ with dominant/major/minor rules
scholar (ethnography; quoted in Rees Workshop booklet) — Paul Berliner’s Thinking in Jazz has a section on ‘The Harris Half-Step Practice Model’ (library or paywalled).
- The Barry Harris Workshop Video (Part 1), Howard Rees / Jazz Workshop Productions: 4+ hours, 5 clinic segments + 102-112 page workbook (ABCs, scales on song forms, movable chords, rhythm section, vocalizing)
Barry himself (produced and transcribed by Howard Rees) — Barry’s own workshop video and workbook, where the practice model is laid out (paywalled; contents list free).