Guitar Dictionary Category
Scales, Melody & Improvisation
What Is the Blues Scale on Guitar?
The term blues scale most often refers to the six-note minor blues scale: a minor pentatonic scale with an added flattened fifth. Its interval formula is 1–♭3–4–♭5–5–♭7. In A, the notes are A–C–D–E♭–E–G.
The added ♭5 is commonly called the blue note in this scale. It creates tension between the fourth and fifth degrees and is often used as a passing tone, slide destination or bend target rather than as a note that must be held for a long time.
There is also a major blues scale, commonly written 1–2–♭3–3–5–6. It has a brighter sound and appears frequently in country, gospel, rock and major-key blues. The two scales can be mixed, but they are not interchangeable in every phrase.
How the Blues Scale Relates to Minor Pentatonic
The minor pentatonic scale contains the root, minor third, fourth, fifth and minor seventh. Adding the ♭5 produces the minor blues scale. This relationship makes the scale easy to learn if the pentatonic pattern is already familiar.
Do not treat the six notes as equally stable. The root, minor third, fifth and minor seventh often sound settled in a minor blues context. The fourth and flattened fifth usually create more movement. Their effect also changes as the underlying chord moves through a 12-bar form.
One-Octave A Blues Scale
A minor blues scale: A C D Eb E G A e|---------------------------5-| B|---------------------5-8-----| G|---------------5-7-8---------| D|---------5-7-----------------| A|---5-6-7---------------------| E|-5---------------------------|
Play the pattern slowly and say the scale degrees. Then remove the ♭5 and compare the minor pentatonic sound. Add it again only between D and E so you hear its function as a passing tone.
Using the Scale over a Blues Progression
A common beginner approach is to use one minor blues scale over all three dominant seventh chords of a 12-bar blues. This can work because the scale creates the major-minor tension associated with blues language. It does not mean every note is equally effective over every chord.
As your ear develops, target chord tones when the harmony changes. In an A blues, listen for how C♯ in A7, F♯ in D7 and G♯ in E7 relate to the C, F and G notes found in the A minor blues vocabulary. Bends and slides can connect these pitch areas expressively.
Moving Beyond One Box
Learn the roots inside the pattern, then connect the shape to another position instead of running vertically from the lowest note to the highest. Practise two- or three-note motifs across position boundaries. The goal is to hear one scale across the neck, not five unrelated boxes.
Why the Blues Scale Matters
The blues scale provides an accessible route into riffs and improvisation, but it is not a complete soloing method by itself. Rhythm, repetition, articulation, chord awareness and space determine whether the notes become a convincing blues phrase.
Kalymi Tip
Start with the minor pentatonic scale and add the flattened fifth deliberately. In my guitar theory and Open E cigar box guitar lessons, the ♭5 is shown as the extra note that gives the minor blues scale its characteristic tension.
Treat it as a passing tone first. Play D–E♭–E in A blues, then reverse the direction. Once your ear and pitch control are stronger, experiment with holding the note briefly, sliding into it or bending toward it.
Do not spend all your time running one vertical box. Locate the roots, connect two positions and create a short rhythmic riff. A small idea repeated and varied will teach you more about blues phrasing than another fast scale run.
Related Terms
Learn More
- Guitar Scales Chart
- Guitar Theory: Roots, Movable Chords and Intervals
- Open E Cigar Box Guitar and Blues Tutorial
- Open D Blues Riffs and Solos Companion
- Blues Guitar Poster
- Guitar Learning Path
Reviewed by
Brent C. Robitaille,
music educator and founder of
Kalymi Music.