Minor Blues
The 12-bar form in a minor key · i7 – iv7 – i7 – V7 (across 12 bars)
The minor blues is the 12-bar blues form transplanted into a minor key. The tonic and subdominant become minor seventh chords (i7 and iv7) instead of dominant sevenths, which trades the earthy swagger of the major blues for something darker, more brooding, and more introspective. The V chord usually stays dominant, providing the one strong pull back to the tonic, and the last four bars often add a jazzy ♭VI7 – V7 or iiø7 – V7 turnaround. It is the harmonic home of B.B. King's "The Thrill Is Gone" and Coltrane's "Mr. P.C.".
The 12-bar minor blues
i7 for four bars, iv7 for two, back to i7, then V7 – iv7 – i7 – V7 to close and loop. The minor cousin of the standard 12-bar. Try it in any key — minor blues transposes just like the major form.
Toggle voice leading in the player to hear it smooth out, or learn voice leading →
The smoky midnight blue palette on this page is inspired by music-color synesthesia — minor blues maps to smoky midnight blue, reflecting its brooding, after-midnight melancholy.
About Minor Blues
The defining difference between a major and a minor blues is the quality of the I and IV chords. In the standard 12-bar blues, I and IV are dominant sevenths (I7, IV7) — that is the chord that gives the major blues its rough, unresolved, slightly dangerous sound. In the minor blues, the tonic and subdominant become minor seventh chords (i7, iv7). That single change shifts the whole emotional center of the form: where the major blues struts, the minor blues broods. The progression is otherwise the same 12-bar skeleton, which is why a blues player can move between the two forms instantly.
The V chord is where the minor blues gets interesting. The most idiomatic choice keeps V as a dominant seventh (V7) even though the key is minor — borrowing the major third of the dominant from the harmonic minor scale so the chord retains its strong leading-tone pull back to the tonic. Without that dominant V, the form can sag and lose its sense of return. Some players use a minor v7 for a more modal, less goal-directed sound (the "Dorian" minor blues), but the dominant V7 is the classic move and the one that makes the form cadence convincingly.
The last four bars are where the minor blues borrows most heavily from jazz. The simplest version is V7 – iv7 – i7 – V7, mirroring the major blues turnaround. But two jazzier endings are extremely common. The first replaces bars 9–10 with ♭VI7 – V7, a chromatic two-chord climb down into the tonic that is the single most recognizable sound in the jazz minor blues. The second uses iiø7 – V7, the full minor ii–V cadence, which connects the blues directly to the minor-key jazz standards built on the same cadence. Either ending turns a plain blues into something that sits comfortably on a jazz bandstand.
The minor blues is the harmonic backbone of an enormous amount of music beyond the blues proper. B.B. King's "The Thrill Is Gone" is the most famous example — a 12-bar minor blues with a string arrangement. John Coltrane wrote two canonical minor blues, "Mr. P.C." (a fast, hard-driving C minor blues) and "Equinox" (a slow, modal C♯ minor blues). Led Zeppelin's "Since I've Been Loving You" is a minor blues stretched into an epic rock ballad. Once you can hear the i7–iv7–V7 shape, you start finding it under soul ballads, film noir cues, and slow rock numbers everywhere.
Variations
Minor blues with the ♭VI7 – V7 turnaround
The jazz minor blues. Bars 9–10 become ♭VI7 – V7, a chromatic climb down into the tonic — the genre's signature ending.
Minor blues with the iiø7 – V7 cadence
Closes with the full minor ii–V, tying the blues directly to minor-key jazz standards.
Famous songs & pieces
- The Thrill Is Gone — B.B. King (The most famous 12-bar minor blues)
- Mr. P.C. — John Coltrane (A fast, hard-driving C minor blues)
- Equinox — John Coltrane (A slow, modal C♯ minor blues)
- Since I've Been Loving You — Led Zeppelin (Minor blues stretched into a rock ballad)
- Black Magic Woman — Santana / Peter Green (Minor blues feel in D minor)
- Why Did You Do It — Stretch (Funk-rock built on a minor blues)