Miles Davis · 1959 · B♭ major · 12-bar blues
An ordinary B♭ blues until the last two bars, where an A♭7 appears instead of the expected turnaround. One borrowed chord, and the whole form suddenly ends somewhere softer than it should.
Analyzed excerpt Valid harmonic variant
Form: 12-bar blues · Bars 1–12
Bb7 | Eb7 | Bb7 | Bb7 | Eb7 | Eb7 | Bb7 | Bb7 | F7 | Eb7 | Ab7 | Bb7
Bar 11 is the ♭VII7 resolving up into I7 in bar 12 — the second-time reading. On the first pass both closing bars stay on A♭7.
This is a short excerpt quoted for analysis, not the full chart, and this composition is very likely still in copyright. Published versions and recordings disagree with each other about the rest of the tune, and often about these bars too.
Every one of these tunes is assembled out of the same handful of harmonic resources. Jazz Harmony is those resources, explained in the order in which they build on each other.
| Chord | Roman numeral | Function | What it is doing | Confidence |
|---|---|---|---|---|
| Bb7 | I7 | Tonic | Bb7 is the tonic, but built as a dominant seventh — the sound that defines the blues. The tonic keeps a b7 and stays at home anyway. Also readable as V7/IV. | Medium |
| Eb7 | IV7 | Predominant | Eb7 is the IV of a blues, built as a dominant seventh. In this context that is its normal quality, not a dominant of anything. | High |
| Bb7 | I7 | Tonic | Bb7 is the tonic, but built as a dominant seventh — the sound that defines the blues. The tonic keeps a b7 and stays at home anyway. | High |
| Bb7 | I7 | Tonic | Bb7 is the tonic, but built as a dominant seventh — the sound that defines the blues. The tonic keeps a b7 and stays at home anyway. Also readable as V7/IV. | Medium |
| Eb7 | IV7 | Predominant | Eb7 is the IV of a blues, built as a dominant seventh. In this context that is its normal quality, not a dominant of anything. | High |
| Eb7 | IV7 | Predominant | Eb7 is the IV of a blues, built as a dominant seventh. In this context that is its normal quality, not a dominant of anything. | High |
| Bb7 | I7 | Tonic | Bb7 is the tonic, but built as a dominant seventh — the sound that defines the blues. The tonic keeps a b7 and stays at home anyway. | High |
| Bb7 | I7 | Tonic | Bb7 is the tonic, but built as a dominant seventh — the sound that defines the blues. The tonic keeps a b7 and stays at home anyway. | High |
| F7 | V7 | Dominant | F7 is the dominant of Bb. Its third and seventh form a tritone, and that tritone is what makes the tonic feel due. | High |
| Eb7 | V7 | Dominant | Eb7 is the dominant of Ab. Its third and seventh form a tritone, and that tritone is what makes the tonic feel due. | High |
| Ab7 | V7/IV | Dominant | Ab7 is functioning as V7/IV: a secondary dominant. It is the dominant of Db, not of the home key, so it borrows the pull of a V-I and points it at IV instead. Also readable as I7. | Low |
| Bb7 | V7/V | Dominant | Bb7 is functioning as V7/V: a secondary dominant. It is the dominant of Eb, not of the home key, so it borrows the pull of a V-I and points it at V instead. | Medium |
Bars 10-12 lean towards Ab major without settling — a tonicization rather than a new key.
High, medium and low next to each numeral are judgements about musical context, not probabilities. A low rating marks a bar that can honestly be read more than one way. How the ratings are decided →
Read in Bb major, these bars come out as I7 – IV7 – V7 – V7/IV – V7/V. Inside those 12 chords there is at least one secondary dominant. The shortest way in is a two-voice reduction: third and seventh only, slowly. Bb7 contributes D and Ab, and where that pair resolves is the whole story of the passage. You will meet the same move again in Now’s the Time, Billie’s Bounce and Straight, No Chaser, transposed and at a different pace.
A twelve-bar blues that is entirely conventional for eleven of its bars and then does one thing: instead of the expected turnaround, it steps to a dominant a whole tone below the tonic and resolves from there. One substitution, in one place, repeated every chorus. Because everything around it is standard, that single alteration is completely audible, which makes the tune an unusually clean demonstration of how little it takes to change the character of a form.
Also from Kind of Blue. It is the one track on the album where Bill Evans does not play — Wynton Kelly takes the piano chair, and the difference in touch and in comping is the reason the track sits apart from the rest of the record. The title refers to a Philadelphia acquaintance of Davis’s. Of the five pieces on that album this is the most conventional, and it is usually the one a student can play first.
The excerpt is loaded and editable. Swap a chord for its tritone substitute, delete the preparation, borrow one from the parallel minor, and watch which numerals change and which do not.
What this device is, and the other standards in the library that use it.
Read →What this device is, and the other standards in the library that use it.
Read →Charlie Parker · 1945 · F major
Chord progression →Charlie Parker · 1945 · F major
Chord progression →Thelonious Monk · 1951 · F major
Chord progression →The families every standard is assembled from, with examples from the library.
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