Blues Scale for Guitar
If the minor pentatonic is the skeleton of rock and blues guitar, the blues scale is the flesh on those bones. One added note, the "blue note," turns simple pentatonic runs into something that bends, cries, and sings.
Try it interactively
Select 'Blues' in the Scale Explorer to see the blue note highlighted alongside the pentatonic tones.
What Is the Blues Scale?
The blues scale is the minor pentatonic with one chromatic addition: the diminished 5th (♭5), also written as ♯4. This note sits exactly between the 4th and 5th of the scale, creating a clash that wants to move. Blues musicians use this tension deliberately. Bending or sliding the ♭5 up to the 5th is one of the most recognisable sounds in the whole genre.
A Blues Scale
Intervals: Root — ♭3 — 4 — ♭5 — 5 — ♭7
Semitones from root: 0 — 3 — 5 — 6 — 7 — 10
Common Genres
| Genre | How the Blues Scale Is Used |
|---|---|
| Blues | Primary soloing vocabulary. The b5 passing note defines the classic blues cry over I7–IV7–V7. |
| Rock | Hendrix, Clapton, SRV — rock lead guitar freely mixes pentatonic and blues scale in the same phrase. |
| Jazz-blues | Early jazz and jazz-blues traditions; bebop players add the blue note over dominant 7th chords. |
| Gospel | The major blues scale (pentatonic major + b3) is a staple of gospel guitar and organ. |
| Country blues | Delta and country blues styles are built around the blue note and string-bending tradition. |
The Blue Note in Context
The ♭5 is not meant to be a landing point. It's a passing note. The most common usages are:
- Chromatic slide: Slide from the 4th through the ♭5 up to the 5th — instant blues.
- Bend: Play the 4th and bend it a half step up to the ♭5, or a whole step to the 5th.
- Passing note: Walk down from 5th → ♭5 → 4th for a classic descending lick.
- Tension hold: Play and hold the ♭5 over a V chord before resolving to the root.
Blues Scale vs. Minor Pentatonic: Side by Side
| Scale | Notes | Intervals | Blue Note? |
|---|---|---|---|
| Pentatonic Minor | A C D E G | R b3 4 5 b7 | No |
| Blues Scale | A C D D# E G | R b3 4 b5 5 b7 | Yes — D# (b5) |
Every note in the pentatonic minor is also in the blues scale. The ♭5 is the only addition. This means you can freely mix both scales in the same solo, and most blues guitarists do.
Common Chords and the 12-Bar Blues
The blues scale is built for dominant 7th chords. A dominant 7th chord (R–3–5–♭7) contains the same ♭7 as the blues scale, and the tension between the scale's ♭3 and the chord's major 3rd is the core of the blues sound — not an error, but a deliberate expressive clash.
12-Bar Blues in A (I7–IV7–V7)
| Bars | Chord | Blues Scale Approach |
|---|---|---|
| 1–4 | A7 (I7) | Play freely — all blues scale tones work. Phrase around the root A. |
| 5–6 | D7 (IV7) | Treat D as a temporary root; the ♭5 (E♭) adds tension over this chord. |
| 7–8 | A7 (I7) | Return home. Root-focused phrases and bends work well here. |
| 9 | E7 (V7) | Build tension. The ♭5 (B♭) clashes beautifully against E7. |
| 10 | D7 (IV7) | Step down in tension toward the turnaround. |
| 11–12 | A7 → E7 (turnaround) | Descend ♭3 → ♭5 → root, or hold a vibrato root note into the E7. |
The Major Blues Scale
There is also a major blues scale: the pentatonic major with an added ♭3. For G major blues: G — A — B♭ — B — D — E. This scale has a brighter, more uplifting sound than the minor blues and is widely used in country, gospel, and upbeat blues.
Mixing Major and Minor Blues
The most sophisticated blues players mix major and minor pentatonic (and blues) scales within a single solo. The ♭3 of the minor pentatonic clashes deliciously with the 3 of the major scale. That ambiguity is the very definition of the blues sound. BB King and Eric Clapton both masterfully blended these two colours.
Recommended Listening
- "The Thrill Is Gone" — BB King (minor blues)
- "Crossroads" — Cream / Eric Clapton (mixed major/minor)
- "Texas Flood" — Stevie Ray Vaughan (heavy blue note usage)
- "Red House" — Jimi Hendrix (pentatonic + blue note bends)
Practice Tips
Getting Started with the Blue Note
- Know the pentatonic first: add the ♭5 only after you can navigate the pentatonic box pattern cleanly.
- One note at a time: introduce the ♭5 as a chromatic slide — from the 4th, slide one fret up to the ♭5, then one more to the 5th.
- Bend into it: play the 4th (D at fret 5 on string 4 in A blues) and bend up a half step — that is the ♭5 without changing fret position.
- Land on stable tones: finish phrases on the root, 5th, or ♭7. The ♭5 is a passing note, not a destination.
- Slow backing track: improvise over a 12-bar blues at 60–70 bpm before pushing the tempo.