C Jam Blues Chord Progression & Harmonic Analysis | Niels Dalgaard
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Duke Ellington · 1942 · C major · 12-bar blues

C Jam Blues — Chord Progression & Harmonic Analysis

Two notes of melody and the twelve-bar form underneath, unaltered. It is the best first analysis anyone can do: the dominant seventh on the tonic is not a dominant of anything, and this tune proves it.

Roman numeral analysis

Chord progression

Analyzed excerpt

Form: 12-bar blues · Bars 1–12

C7 | C7 | C7 | C7 | F7 | F7 | C7 | C7 | G7 | F7 | C7 | G7

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.

The books behind this page

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.

Start here Project 03 · Harmony

Jazz Harmony

From tradition to the expectation framework · For any instrument Project 05 · Harmony

Harmonic Narrative

A practical method for creating and understanding harmonic progressions through expectation Project 04 · Jazz guitar

Jazz Guitar Comping

Creating direction through harmony, rhythm and the expectation framework

Harmonic analysis

Key
C major
Tonal center
C
Confidence
High
Chords analysed
12
ChordRoman numeralFunctionWhat it is doingConfidence
C7I7TonicC7 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
C7I7TonicC7 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
C7I7TonicC7 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
C7I7TonicC7 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
F7IV7PredominantF7 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
F7IV7PredominantF7 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
C7I7TonicC7 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
C7I7TonicC7 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
G7V7DominantG7 is the dominant of C. Its third and seventh form a tritone, and that tritone is what makes the tonic feel due.High
F7IV7PredominantF7 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
C7I7TonicC7 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
G7V7DominantG7 is the dominant of C. Its third and seventh form a tritone, and that tritone is what makes the tonic feel due.High

What the analyzer found in it

half cadenceG7

The progression stops on the dominant of C — a half cadence. It is unfinished on purpose.

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 →

Why this example matters

Numbered against C major, the excerpt is I7 – IV7 – V7. There is no substitution and no borrowing in it at all, which is exactly why it is worth playing: it is the sound the substitutions are substituting for. Take the roots away and keep the third and seventh. In C7 that is E and Bb. Those two notes decide where the progression is going, and hearing them move is worth more than naming the chords. Now’s the Time, Billie’s Bounce and Straight, No Chaser use the same device, which is the argument for learning it once properly rather than three times by accident.

How the rest of C Jam Blues goes

The melody uses two pitches. That is not an exaggeration or a simplification for teaching — the head is a rhythmic figure on one note answered by another, over a completely standard twelve-bar blues. Everything that makes a performance of it good happens somewhere other than the written notes: in the placement, in the way the rhythm section responds, in what the soloists build. It is the clearest demonstration in the repertoire that a tune is a set of conditions, not a set of pitches.

C Jam Blues on record

Duke Ellington recorded it in 1942, and it had earlier circulated in a version credited to his violinist Barney Bigard under another title. Because it can be taught in under a minute and played by an ensemble of any size and skill, it became the standard opener for jam sessions and for teaching groups, and it remains the tune most likely to be called when nobody can agree on what to call.

Analyze this progression

Open these chords in the analyzer and change them. Move one chord, substitute a dominant, take the ii away — the reading updates and tells you what you just did.

Open in Jazz Harmony Analyzer →

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