# Blues scale
The blues scale is a six-note (hexatonic) scale formed by adding a flatted fifth to the minor pentatonic scale, with the interval structure 1, ♭3, 4, ♭5, 5, ♭7[1](https://www.guitarworld.com/lessons/techniques/how-to-get-out-of-the-pentatonic-rut). The added ♭5 is called the blue note, and the pentatonic and blues scales are the backbone of blues, rock, and improvisation[2](https://piano.org/theory/pentatonic-blues/).
| Key fact | Detail |
|---|---|
| Construction | Minor pentatonic (1, ♭3, 4, 5, ♭7) plus one added note, the flatted fifth[1](https://www.guitarworld.com/lessons/techniques/how-to-get-out-of-the-pentatonic-rut) |
| Notes in C | C, E♭, F, G♭, G, B♭; the G♭ is the only difference from C minor pentatonic[2](https://piano.org/theory/pentatonic-blues/) |
| Notes in A | A, C, D, E♭, E, G[1](https://www.guitarworld.com/lessons/techniques/how-to-get-out-of-the-pentatonic-rut) |
| The blue note | A tritone above the root, the most dissonant pitch in the scale, normally used as a passing tone between the 4th and 5th[2](https://piano.org/theory/pentatonic-blues/) |
| Related major form | Viewed from the root of the relative major, the same collection is a major pentatonic with a raised 2nd (♯2) added, the major blues scale[3](https://docdrop.org/download_annotation_doc/Rawlins-Bahha---2009---Jazzology-uk8di.pdf) |
| Pedagogical status | The fixed six-note scale is a simplification of the flexible pitch areas of actual blues intonation, and in jazz pedagogy it is often taught as a key-centered improvisational tool rather than a chord-specific device[4](https://book.fretboardfoundation.com/pentatonic-and-blues-scales.html) • [5](https://en.alegsaonline.com/art/12406) |
## Structure and the blue note
The scale is built directly from the minor pentatonic, which in C is C, E♭, F, G, B♭. Adding the single note G♭, a flatted fifth, yields the blues scale[2](https://piano.org/theory/pentatonic-blues/). The same recipe in A gives A, C, D, E♭, E, G, where E♭ sits between the fourth (D) and fifth (E)[1](https://www.guitarworld.com/lessons/techniques/how-to-get-out-of-the-pentatonic-rut).
**Why the extra note matters.** The minor pentatonic deliberately removes the two notes that create half steps against the parent seven-note scale, although its minor third can still clash with the major third of accompanying major or dominant chords, a friction central to the blues sound[15](https://www.harmony.org.uk/book/pop_and_rock_music_blues_progression.htm). The blues scale restores a single dissonance: falling a tritone above the root, the blue note lies midway between degrees 4 and 5, making it the collection's most dissonant tone.[2](https://piano.org/theory/pentatonic-blues/) Its role is motion, not rest. Played as a chromatic stepping stone between the fourth and fifth, going up or coming down, it adds tension that resolves immediately; stopping on it sounds harsh[6](https://www.grammarofmusic.com/en/topics/blues-scale).
## Blue notes and flexible pitch
The scale as written in equal temperament is a codification of something less fixed. Blues singers emphasize "blue notes," usually the third, fifth, and seventh degrees of the scale, which they often slur or bend upward a quarter tone or more, effects that accompanying instruments such as the fiddle, harmonica, or guitar mimic[7](https://www.loc.gov/collections/songs-of-america/articles-and-essays/musical-styles/popular-songs-of-the-day/blues/). On freely intonating instruments these pitches vary with context rather than occupying fixed keyboard positions.
The textbook scale is therefore a compromise: when theorists began analyzing blues music, they struggled to hear the microtones required to produce blues intonation on 12-TET (12-tone equal temperament, the standard modern keyboard tuning) Western instruments, and simplified blues tonality for instruction by describing it as a minor pentatonic with an added ♭5/♯4, or a major pentatonic with an added ♯2/♭3[4](https://book.fretboardfoundation.com/pentatonic-and-blues-scales.html). A serious study of blues tuning finds bittersweet ambiguity in the microtones between the fixed pitches, sometimes termed "blue notes" or "blues curls"[8](https://www.gresham.ac.uk/sites/default/files/transcript/2024-01-18-1800_Mermikides-T.pdf). Some writers treat any note played with expressively altered intonation as a blue note[9](https://www.uvm.edu/~dfeurzei/009x/assignments/asst29/blues_scale.pdf), and in practice players add further colors, the major third alongside the flat third being the most common, so the scale is better understood as a flexible vocabulary than a fixed list[2](https://piano.org/theory/pentatonic-blues/).
## Minor and major blues scales
The familiar six-note scale is sometimes called the minor blues scale, because it starts from the minor pentatonic. From the root of the relative major, the same collection can be viewed as a major pentatonic scale with a raised 2nd added, which is called the major blues scale[3](https://docdrop.org/download_annotation_doc/Rawlins-Bahha---2009---Jazzology-uk8di.pdf).
The two forms serve different repertoires. The minor pentatonic is inherently minor-sounding, yet many blues progressions are major chord-based, built on dominant seventh chords such as A7, D7, and E7 in an A blues; over such harmony, the deliberate clash between the scale's minor third and the chord's major third is a defining part of the blues sound[1](https://www.guitarworld.com/lessons/techniques/how-to-get-out-of-the-pentatonic-rut) • [2](https://piano.org/theory/pentatonic-blues/). Players commonly blend the minor blues scale with major pentatonic notes and chord tones, and over a dominant blues progression may combine minor-pentatonic phrases with the major third or major-pentatonic notes[10](https://jamuzo.com/knowledge-base/what-is-the-blues-scale/).
## History and pedagogy
Blues as a genre was recognizable in the [Southern United States](https://www.edgepedia.org/southern-united-states) by the 1890s, though no recordings of blues songs exist before the 1910s[7](https://www.loc.gov/collections/songs-of-america/articles-and-essays/musical-styles/popular-songs-of-the-day/blues/). The naming of a "blues scale" came much later. According to one history of jazz piano pedagogy, the Vincent Lopez Modern Piano Method of 1933–34 appears to be the first publication to identify a blues scale, teaching students to improvise "hot" on a tune's form and harmonies with an admixture of the blues, and anticipating chord-scale theory by equating "blued" chords and blue scales[11](https://www.mtosmt.org/issues/mto.25.31.3/mto.25.31.3.martin.php).
In modern jazz teaching, the scale is typically presented as a key-centered improvisational tool rather than a chord-specific device[5](https://en.alegsaonline.com/art/12406), a usage carried through classroom materials that have students compose twelve-bar blues melodies from its notes over the standard I-IV-V progression[12](https://pulse.berklee.edu/content/public/pub_unit_assets/lessons/lesson3_banded/Minor%20Pentatonic%20to%20Blues.pdf). Ethnomusicologist Jeff Todd Titon, in his 1977 study *Early Downhome Blues*, extended the concept considerably, creating a "generative model" illustrating the melodic possibilities available to a performer building an individual phrase[13](https://academic.oup.com/ml/article/106/3/420/8125057).
## Use beyond the blues
The pentatonic and blues scales are the backbone of blues, rock, and improvisation, and a great deal of American popular music written between roughly 1920 and 1970 draws on the six-note vocabulary; plenty of music that does not sound bluesy on the surface contains blues-scale licks[2](https://piano.org/theory/pentatonic-blues/). Guitarists use the scale across the fretboard in improvisation; the guitarist [Eric Gales](https://www.edgepedia.org/eric-gales), for example, describes building most lines in free improvisation in E on the E blues scale (E, G, A, B♭, B, D), beginning from [E major](https://www.edgepedia.org/e-major) pentatonic notes and switching immediately to the blues scale[14](https://www.guitarworld.com/lessons/techniques/eric-gales-position-shifts-improv).
## References
1. [People ask me: "How do I get out of the pentatonic rut?" This is what I tell them, Guitar World](https://www.guitarworld.com/lessons/techniques/how-to-get-out-of-the-pentatonic-rut)
2. [Pentatonic and Blues Scales on Piano, piano.org](https://piano.org/theory/pentatonic-blues/)
3. [Blues Scales, Rawlins & Bahha, Jazzology (2007), via DocDrop](https://docdrop.org/download_annotation_doc/Rawlins-Bahha---2009---Jazzology-uk8di.pdf)
4. [Pentatonic and blues scales, Fretboard Foundation](https://book.fretboardfoundation.com/pentatonic-and-blues-scales.html)
5. [Blues scale: structure, history, and musical use, AlegsaOnline](https://en.alegsaonline.com/art/12406)
6. [The blues scale, and the note that is only for passing through, Grammar of Music](https://www.grammarofmusic.com/en/topics/blues-scale)
7. [Blues, Popular Songs of the Day, Library of Congress](https://www.loc.gov/collections/songs-of-america/articles-and-essays/musical-styles/popular-songs-of-the-day/blues/)
8. [The Art and Science of Tuning, Gresham College](https://www.gresham.ac.uk/sites/default/files/transcript/2024-01-18-1800_Mermikides-T.pdf)
9. [Blues scale (course notes), University of Vermont](https://www.uvm.edu/~dfeurzei/009x/assignments/asst29/blues_scale.pdf)
10. [What Is the Blues Scale?, Jamuzo](https://jamuzo.com/knowledge-base/what-is-the-blues-scale/)
11. [Henry Martin, Improvisation in Early Jazz Piano Pedagogy, Music Theory Online 31.3 (2025)](https://www.mtosmt.org/issues/mto.25.31.3/mto.25.31.3.martin.php)
12. [Minor Pentatonic to Blues, Berklee PULSE](https://pulse.berklee.edu/content/public/pub_unit_assets/lessons/lesson3_banded/Minor%20Pentatonic%20to%20Blues.pdf)
13. ['You Get Words, You Play the Blues': Towards A Melopoetics of Mercy Dee Walton's 'Have You Ever Been Out In the Country?', Music and Letters](https://academic.oup.com/ml/article/106/3/420/8125057)
14. [Eric Gales shows you 7 ways to get across the fretboard, Guitar World](https://www.guitarworld.com/lessons/techniques/eric-gales-position-shifts-improv)
15. [Pop and Rock Music Blues Progression](https://www.harmony.org.uk/book/pop_and_rock_music_blues_progression.htm)
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*Topic: Encyclopedia › Arts and culture › Music › Musical practice and theory › Blues › Blues overview and history*
*Initially written Sep 17, 2026 · Reviewed: Sep 30, 2026; Oct 25, 2026 · Edited: Sep 30, 2026; Oct 25, 2026 · Last review: Oct 25, 2026*
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License: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license