Jazz Theory · October 21, 2026
By Justin Comstock · JazzValve creator, longtime guitarist and adult trumpet learner · Updated October 22, 2026
Jazz Blues Chord Changes for Trumpet: Hear the Added Movement
Go beyond the three-chord blues with a written-and-concert chart, clear harmonic landmarks, and an original twelve-bar trumpet study.
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Get Blue Lines freeJazz blues chord changes add movement inside the familiar twelve-bar form. You still have twelve measures, but some contain a passing chord or a short progression pointing toward the next destination. The practical challenge is hearing those arrivals without turning every bar into an arpeggio test.
If counting twelve bars still takes all your attention, start with the basic blues-form lesson. Here, the assignment is different: recognize what the extra chords change, then play a short line that makes those changes audible.
Use one chart, not every possible substitution
All melody notes below are written for B-flat trumpet. The exercise is written C blues, sounding in concert B-flat. Written C4 sounds concert B-flat3; written C5 sounds concert B-flat4. Use the concert column for piano, guitar, or a concert-pitch backing track.
This is one jazz-blues practice version, not a universal chart for every blues recording. Two symbols in a cell each last two beats: the first starts on beat 1 and the second on beat 3. A single symbol lasts all four beats.
| Bar | Written trumpet harmony | Concert accompaniment |
|---|---|---|
| 1 | C7 | B-flat7 |
| 2 | F7 | E-flat7 |
| 3 | C7 | B-flat7 |
| 4 | Gm7, C7 | Fm7, B-flat7 |
| 5 | F7 | E-flat7 |
| 6 | F-sharpdim7 | Edim7 |
| 7 | C7 | B-flat7 |
| 8 | Em7, A7 | Dm7, G7 |
| 9 | Dm7 | Cm7 |
| 10 | G7 | F7 |
| 11 | C7, A7 | B-flat7, G7 |
| 12 | Dm7, G7 | Cm7, F7 |
A track labeled only “B-flat blues” may use different changes. Check its chart before treating a disagreement as a wrong trumpet note. A metronome is enough while learning this version.
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Hear the destinations first
The jazz blues combines blues harmony with ii–V movement and turnarounds. Open Music Theory's blues chapter explains that combination. In this chart, focus on three places:
- Bar 5: Gm7–C7 in bar 4 prepares the arrival on F7. The destination is still the blues IV chord.
- Bar 9: Em7–A7 in bar 8 leads into Dm7. Listen particularly to A7's C-sharp, which signals the approach to Dm7.
- The next bar 1: Bars 11–12 move through C7–A7–Dm7–G7, setting up another C7 chorus.
The quick F7 in bar 2 and the F-sharpdim7 in bar 6 add other colors. Peter Spitzer's blues overview shows how jazz versions can include both a raised-fourth diminished chord and added progressions. Different players may use different substitutions at these locations.
Do not confuse chord quality with the key. C7 contains B-flat even though C is the home note. A7 contains C-sharp even though the exercise is written in C. Read each complete symbol.
Give the diminished chord a small job
Written F-sharpdim7 contains F-sharp, A, C, and E-flat. In this lesson it lasts one bar, between F7 and C7. You do not need a new eight-note scale to begin hearing it.
Try this two-bar connection in 4/4:
- Bar 6, F-sharpdim7: A4 quarter note, C5 quarter note, E-flat4 quarter note, F-sharp4 quarter note.
- Bar 7, C7: G4 half note, E4 quarter note, quarter rest.
The final F-sharp moves up a half step to G. The notes belong to the written chords above; their concert equivalents are G4, B-flat4, D-flat4, E4, then F4 and D4.
Repeat slowly. If the large C5–E-flat4 drop distracts you, replace C5 with A4 for now. Keep the half-step F-sharp4–G4 intact. That is the connection this miniature study is designed to expose.
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Play an original twelve-bar study
Read the note and rhythm transcript below. Staff notation requires JavaScript.
Notes, rhythm and playing instructions
- Bar 1: beat 1, chord C7, E4 quarter note, fingering 1+2, sounds D4; beat 2, G4 quarter note, fingering open, sounds F4; beat 3, B-flat4 quarter note, fingering 1, sounds A-flat4; beat 4, quarter rest.
- Bar 2: beat 1, chord F7, A4 half note, fingering 1+2, sounds G4; beat 3, E-flat4 quarter note, fingering 2+3, sounds D-flat4; beat 4, quarter rest.
- Bar 3: beat 1, chord C7, E4 quarter note, fingering 1+2, sounds D4; beat 2, G4 quarter note, fingering open, sounds F4; beat 3, B-flat4 quarter note, fingering 1, sounds A-flat4; beat 4, quarter rest.
- Bar 4: beat 1, chord Gm7, B-flat4 quarter note, fingering 1, sounds A-flat4; beat 2, F4 quarter note, fingering 1, sounds E-flat4; beat 3, chord C7, E4 quarter note, fingering 1+2, sounds D4; beat 4, B-flat4 quarter note, fingering 1, sounds A-flat4.
- Bar 5: beat 1, chord F7, A4 half note, fingering 1+2, sounds G4; beat 3, C5 quarter note, fingering open, sounds B-flat4; beat 4, quarter rest.
- Bar 6: beat 1, chord F#dim7, A4 quarter note, fingering 1+2, sounds G4; beat 2, C5 quarter note, fingering open, sounds B-flat4; beat 3, E-flat4 quarter note, fingering 2+3, sounds D-flat4; beat 4, F-sharp4 quarter note, fingering 2, sounds E4.
- Bar 7: beat 1, chord C7, G4 half note, fingering open, sounds F4; beat 3, E4 quarter note, fingering 1+2, sounds D4; beat 4, quarter rest.
- Bar 8: beat 1, chord Em7, G4 quarter note, fingering open, sounds F4; beat 2, B4 quarter note, fingering 2, sounds A4; beat 3, chord A7, C-sharp5 quarter note, fingering 1+2, sounds B4; beat 4, G4 quarter note, fingering open, sounds F4.
- Bar 9: beat 1, chord Dm7, F4 half note, fingering 1, sounds E-flat4; beat 3, A4 quarter note, fingering 1+2, sounds G4; beat 4, quarter rest.
- Bar 10: beat 1, chord G7, B4 quarter note, fingering 2, sounds A4; beat 2, G4 quarter note, fingering open, sounds F4; beat 3, F4 half note, fingering 1, sounds E-flat4.
- Bar 11: beat 1, chord C7, E4 quarter note, fingering 1+2, sounds D4; beat 2, G4 quarter note, fingering open, sounds F4; beat 3, chord A7, C-sharp5 quarter note, fingering 1+2, sounds B4; beat 4, G4 quarter note, fingering open, sounds F4.
- Bar 12: beat 1, chord Dm7, F4 quarter note, fingering 1, sounds E-flat4; beat 2, A4 quarter note, fingering 1+2, sounds G4; beat 3, chord G7, B4 quarter note, fingering 2, sounds A4; beat 4, F4 quarter note, fingering 1, sounds E-flat4.
Show a full jazz-blues chorus with beat-3 chord changes, diminished passing harmony, and turnaround. Steady quarter-note pulse; no invented swing interpretation. Accompaniment reference. Bar 1: written C7 sounds concert Bb7. Bar 2: written F7 sounds concert Eb7. Bar 3: written C7 sounds concert Bb7. Bar 4: written Gm7 sounds concert Fm7. Bar 4: written C7 sounds concert Bb7. Bar 5: written F7 sounds concert Eb7. Bar 6: written F#dim7 sounds concert Edim7. Bar 7: written C7 sounds concert Bb7. Bar 8: written Em7 sounds concert Dm7. Bar 8: written A7 sounds concert G7. Bar 9: written Dm7 sounds concert Cm7. Bar 10: written G7 sounds concert F7. Bar 11: written C7 sounds concert Bb7. Bar 11: written A7 sounds concert G7. Bar 12: written Dm7 sounds concert Cm7. Bar 12: written G7 sounds concert F7. Concert pitches in the transcript are references only; play the written pitches on B-flat trumpet. No audio playback or fixed swing ratio is implied.
Set a metronome to quarter note = 60–72 in 4/4. Use the chart above. Every bar below totals four beats, including rests. The range is written E-flat4 to C-sharp5; sing any passage that is not yet comfortable on the horn.
- C7: E4 quarter, G4 quarter, B-flat4 quarter, quarter rest.
- F7: A4 half, E-flat4 quarter, quarter rest.
- C7: E4 quarter, G4 quarter, B-flat4 quarter, quarter rest.
- Gm7–C7: B-flat4 quarter, F4 quarter, E4 quarter, B-flat4 quarter.
- F7: A4 half, C5 quarter, quarter rest.
- F-sharpdim7: A4 quarter, C5 quarter, E-flat4 quarter, F-sharp4 quarter.
- C7: G4 half, E4 quarter, quarter rest.
- Em7–A7: G4 quarter, B4 quarter, C-sharp5 quarter, G4 quarter.
- Dm7: F4 half, A4 quarter, quarter rest.
- G7: B4 quarter, G4 quarter, F4 half.
- C7–A7: E4 quarter, G4 quarter, C-sharp5 quarter, G4 quarter.
- Dm7–G7: F4 quarter, A4 quarter, B4 quarter, F4 quarter.
At the repeat, bar 12's F4 moves to bar 1's E4. Keep that return in time. Take a breath during an earlier rest rather than adding a beat after bar 12.
The study uses thirds and sevenths alongside other chord tones. Those identifying tones are discussed in Hutchinson's guide-tone explanation. You can review their basic sound in the trumpet guide-tone lesson.
Keep the useful parts and simplify the rest
First record only bars 4–9. Listen for E4 arriving halfway through bar 4, F-sharp4 reaching G4 across bars 6–7, and C-sharp5 appearing on A7 in bar 8. These are specific listening checks, not a demand for a polished solo.
Next, play the whole chorus. On a second pass, replace bars 1 and 3 with your own short blues phrase while keeping bars 4, 6, 8, and 12 unchanged. This lets familiar blues language sit beside the new harmonic movement.
If a connection fails, loop the two relevant bars at the same slow tempo. Adding notes usually makes the diagnosis harder. Finish when you can hear the added chord and its destination, even before you play them.
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Thirty days of focused B♭ trumpet practice: tone, time, jazz language and improvisation.
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Get Blue Lines freeSources
- Bryn Hughes and Megan Lavengood, Open Music Theory, Blues Harmony: https://viva.pressbooks.pub/openmusictheorycopy/chapter/blues-harmony/
- Peter Spitzer, JazzStandards.com, Blues: https://www.jazzstandards.com/theory/blues.htm
- Robert Hutchinson, Music Theory for the 21st-Century Classroom, Jazz Chord Voicings: https://musictheory.pugetsound.edu/mt21c/JazzChordVoicings.html