Jazz Theory · October 21, 2026
By Justin Comstock · JazzValve creator, longtime guitarist and adult trumpet learner · Updated October 22, 2026
Rhythm Changes for Trumpet: Map the Form and Play the Bridge
Learn the 32-bar AABA shape, a practical written-C chart, and an original bridge study for rhythm changes in concert B-flat.
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Get Blue Lines freeRhythm changes is the name of a chord-progression family, not an instruction to keep changing your rhythm. Its usual jazz form has 32 bars arranged AABA, with eight bars in each section. For trumpet practice, separate two jobs: know where each section begins, then hear the chord movement inside it.
The progression developed from George Gershwin's “I Got Rhythm,” but jazz versions are not identical to the original song. Peter Spitzer's rhythm-changes overview explains that distinction and common variations. The chart here is a learning version, not a transcription of a particular performance.
Set the pitch convention before playing
Everything labeled written is for B-flat trumpet. This lesson uses written C, which sounds in concert B-flat. Written C4 sounds B-flat3; written C5 sounds B-flat4. A pianist accompanying you should use the concert column, not the written symbols.
Use a track only if its harmony matches this version. If you are unsure about the labeling, review B-flat trumpet transposition. Playing the right notes over a track in the wrong key will not help you learn the form.
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Build the first eight bars
Use 4/4. Whenever a row contains two chords, give each two beats: beats 1–2, then beats 3–4. A single chord occupies the whole measure.
| A1 bar | Written harmony | Concert harmony |
|---|---|---|
| 1 | C6, A7 | B-flat6, G7 |
| 2 | Dm7, G7 | Cm7, F7 |
| 3 | C6, A7 | B-flat6, G7 |
| 4 | Dm7, G7 | Cm7, F7 |
| 5 | Gm7, C7 | Fm7, B-flat7 |
| 6 | F6, Fm6 | E-flat6, E-flatm6 |
| 7 | C6, A7 | B-flat6, G7 |
| 8 | Dm7, G7 | Cm7, F7 |
A 6 chord has a major triad plus the major sixth: C6 is C–E–G–A. F6 is F–A–C–D, while Fm6 is F–A-flat–C–D. The lowercase m changes the third, not the sixth. A7 is A–C-sharp–E–G, so this chart needs C-sharp even though the home key is written C.
Think of the opening as two short trips back toward C. Bars 5–6 then visit F before the turnaround returns you toward C again. Jazz Guitar Online's rhythm-changes lesson identifies the move toward IV and the dominant-cycle bridge as useful landmarks across many versions. The harmonic landmarks apply regardless of instrument.
Turn eight bars into the whole form
Write four boxes on paper: A1, A2, B, A3. Give each box eight spaces. Fill them as follows:
- A1, bars 1–8: use the table exactly.
- A2, bars 9–16: repeat the table's first six bars. In bar 15 play C6 for two beats, then G7 for two beats. Hold C6 throughout bar 16.
- B, bars 17–24: use the bridge table below.
- A3, bars 25–32: repeat A2, including its closing C6 bar.
For concert accompaniment, the altered A-section endings are B-flat6–F7, then a full bar of B-flat6.
The final A ending can vary, especially when a band wants a turnaround into another chorus. Agree on the version rather than assuming every A section is identical. For this exercise, bar 32 stays C6; the next chorus begins with C6–A7.
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Hear the bridge as four two-bar spans
The bridge moves through four dominant seventh chords. Each lasts two full measures, so the chord changes are less frequent than in the A sections.
| Chorus bars | Written chord | Concert chord | Written third and seventh |
|---|---|---|---|
| 17–18 | E7 | D7 | G-sharp, D |
| 19–20 | A7 | G7 | C-sharp, G |
| 21–22 | D7 | C7 | F-sharp, C |
| 23–24 | G7 | F7 | B, F |
The roots travel E–A–D–G in written pitch. Do not make the third chord Dm7 out of habit: this bridge uses D7, which contains F-sharp.
You can hear the sequence with one descending target per chord: G-sharp4, G4, F-sharp4, F4, then E4 when C6 returns in bar 25. The first four targets alternate thirds and sevenths. Hutchinson's jazz-voicing chapter explains how these guide tones connect by step in circle-of-fifths progressions.
Play an original bridge study
Read the note and rhythm transcript below. Staff notation requires JavaScript.
Notes, rhythm and playing instructions
- Bar 1: beat 1, chord E7, G-sharp4 half note, fingering 2+3, sounds F-sharp4; beat 3, D5 quarter note, fingering 1, sounds C5; beat 4, quarter rest.
- Bar 2: beat 1, chord E7, D5 half note, fingering 1, sounds C5; beat 3, G-sharp4 quarter note, fingering 2+3, sounds F-sharp4; beat 4, quarter rest.
- Bar 3: beat 1, chord A7, G4 half note, fingering open, sounds F4; beat 3, C-sharp5 quarter note, fingering 1+2, sounds B4; beat 4, quarter rest.
- Bar 4: beat 1, chord A7, C-sharp5 half note, fingering 1+2, sounds B4; beat 3, G4 quarter note, fingering open, sounds F4; beat 4, quarter rest.
- Bar 5: beat 1, chord D7, F-sharp4 half note, fingering 2, sounds E4; beat 3, C5 quarter note, fingering open, sounds B-flat4; beat 4, quarter rest.
- Bar 6: beat 1, chord D7, C5 half note, fingering open, sounds B-flat4; beat 3, F-sharp4 quarter note, fingering 2, sounds E4; beat 4, quarter rest.
- Bar 7: beat 1, chord G7, F4 half note, fingering 1, sounds E-flat4; beat 3, B4 quarter note, fingering 2, sounds A4; beat 4, quarter rest.
- Bar 8: beat 1, chord G7, B4 half note, fingering 2, sounds A4; beat 3, F4 quarter note, fingering 1, sounds E-flat4; beat 4, quarter rest.
- Bar 9: beat 1, chord C6, E4 half note, fingering 1+2, sounds D4; beat 3, chord A7, half rest.
Show eight bridge bars plus the first returning A bar, including the silent second chord in source bar 25. Steady quarter-note pulse; no invented swing interpretation. Accompaniment reference. Bar 1: written E7 sounds concert D7. Bar 2: written E7 sounds concert D7. Bar 3: written A7 sounds concert G7. Bar 4: written A7 sounds concert G7. Bar 5: written D7 sounds concert C7. Bar 6: written D7 sounds concert C7. Bar 7: written G7 sounds concert F7. Bar 8: written G7 sounds concert F7. Bar 9: written C6 sounds concert Bb6. Bar 9: written A7 sounds concert G7. Score bars correspond to source form bars 17, 18, 19, 20, 21, 22, 23, 24, 25. 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 the metronome to quarter note = 60. In each bar, the half note starts on beat 1, the quarter note on beat 3, and the quarter rest on beat 4. Keep counting through every breath.
- 17, E7: G-sharp4 half note, D5 quarter note, quarter rest.
- 18, E7: D5 half note, G-sharp4 quarter note, quarter rest.
- 19, A7: G4 half note, C-sharp5 quarter note, quarter rest.
- 20, A7: C-sharp5 half note, G4 quarter note, quarter rest.
- 21, D7: F-sharp4 half note, C5 quarter note, quarter rest.
- 22, D7: C5 half note, F-sharp4 quarter note, quarter rest.
- 23, G7: F4 half note, B4 quarter note, quarter rest.
- 24, G7: B4 half note, F4 quarter note, quarter rest.
- 25, C6: E4 half note, half rest.
Bar 25 is the first bar of the returning A, not an extra bridge bar. Its second chord is A7 in our chart, but you rest through those two beats.
The low target line sounds concert F-sharp4–F4–E4–E-flat4–D4. The upper partners D5, C-sharp5, C5, and B4 sound concert C5, B4, B-flat4, and A4. Start with just the low targets if the two-note pattern divides your attention.
Rejoin the form without guessing
Count A1 and A2 silently, play the bridge study, and stop after bar 25's E. Repeat from the beginning. Check that the bridge begins after sixteen bars, not eight, and that A3 arrives after exactly eight bridge bars.
Then play one full chorus with only a short phrase at the beginning of each A section. Leave the remaining A bars silent while you count. Keep the bridge study unchanged. You are testing whether the form survives space, not how many notes you can fit into it.
When that feels dependable, vary the bridge rhythm while retaining its target notes. Return to the actual tune's chart before playing with others: learning this map should help you notice variations, not prevent you from hearing them.
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- Peter Spitzer, JazzStandards.com, Rhythm Changes: https://www.jazzstandards.com/theory/rhythm-changes.htm
- Jazz Guitar Online, Introduction to Rhythm Changes: https://www.jazzguitar.be/blog/introduction-to-rhythm-changes/
- Robert Hutchinson, Music Theory for the 21st-Century Classroom, Jazz Chord Voicings: https://musictheory.pugetsound.edu/mt21c/JazzChordVoicings.html