Workshop 20 — “I Got Rhythm” / Rhythm Changes: AABA Form, Fast Turnarounds, Dominant Chains, and Thinking One Phrase Ahead
This workshop is a major milestone.
“Rhythm Changes” is not just one tune. It became a harmonic template used in countless jazz compositions and improvisations.
The challenge is:
Can you keep your place in a fast-moving 32-bar form while hearing several chords as one larger harmonic sentence?
The main lessons are:
- AABA form
- rapid I–vi–ii–V motion
- dominant substitutions
- the famous bridge of dominant chords
- anticipating destinations
- simplifying fast harmony
- improvising with motifs rather than chasing chord symbols
- comping economically at faster tempos
- hearing form while soloing
We’ll work conceptually in B♭ major, a very common key for Rhythm Changes.
20.1First learn the form before the chordsThe basic structure is:20.2The A section: tonic-turnaround logicA common conceptual A-section backbone in B♭ is built around:20.3Why G7 instead of Gm7?In B♭ major, diatonic vi is:20.4Hear the lineIn B♭ major:20.5Think “turnaround,” not four separate chordsDo not think:20.6Level 1 — roots onlyPlay:20.7Level 2 — shellsB♭maj7:20.8Notice the voice-leading problemAt faster tempo, you do not want large leaps between every chord.20.9Level 3 — simplify even furtherAt fast tempo:20.10Fast harmony rewards reductionSlow ballad:20.11Level 4 — basic A-section ear mapHear:20.12Level 5 — substitute vi with VI7Compare:20.13Level 6 — extensionsAt medium tempo:20.14But do not make every chord equally colorfulMaybe:20.15The A section is usually not the hardest partThe A section becomes manageable once you hear:20.16The bridge: dominant chainA common bridge concept is a chain of dominant chords moving by fifths.20.17This is pure Circle of FifthsRoots:20.18What each dominant points toD7 points to G.20.19Hear the leading tonesD7:20.20This is the same concept as Workshop 17There we practiced:20.21Level 7 — bridge roots onlyPlay:20.22Level 8 — bridge thirds onlyPlay bass roots.20.23Level 9 — bridge shellsD7: F♯-C20.24The bridge should feel simpler than it looksFour different dominants.20.25Level 10 — bridge as one sentenceDo not phrase:20.26Example target strategyOn D7: target F♯.20.27Level 11 — one note per bar/chordAt first:20.28Level 12 — connect thirds chromatically/diatonicallyTry to connect:20.29Level 13 — dominant scales without overthinkingFor D7: you could think D Mixolydian.20.30The bridge is not a scale examYou can make a convincing bridge solo using:20.31Level 14 — same motif over all dominantsTake a 3-note rhythmic cell.20.32This is extremely powerfulThe harmony changes.20.33Level 15 — use one rhythmic motif onlyEven simpler:20.34Level 16 — alter dominants laterOnce the bridge is secure, add color.20.35Altered D7D7♭9:20.36Altered G7G7♭9:20.37Dominant 13 colorC13:20.38Level 17 — tritone substitutions on the bridgeD7 can become:20.39ExampleOriginal:20.40AnotherG7 → C7.20.41Why not substitute every dominant?Because the bridge’s original identity is the obvious circle-of-fifths chain.20.42Level 18 — A-section substitutionsThe A section itself has many common variants.20.43Structural hearing protects you from variationsIf somebody plays:20.44Level 19 — diminished connectorsExample concept:20.45Hear the shared directional noteB°7 contains:20.46Level 20 — one A section, three versionsPractice:20.47Level 21 — form awareness exerciseSet metronome.20.48Count sections, not just barsInstead of mentally shouting:20.49Level 22 — landmarksPick landmarks:20.50This is an essential improviser skillGood players do occasionally lose a micro-detail.20.51Level 23 — comping the A sectionAt faster tempo:20.52Level 24 — comping the bridgeBecause each bridge dominant lasts longer, you can give each one a clearer identity.20.53This contrast helps formA section: lighter/faster harmonic comping.20.54Level 25 — walking bassRhythm Changes is excellent walking-bass practice.20.55Example into CmOver G7:20.56Bridge bass is especially easy conceptuallyD7 bar(s):20.57Level 26 — solo with chord tones onlyOne full chorus.20.58Level 27 — restrict furtherUse only:20.59Level 28 — one motif per AA1: introduce motif.20.60This is much better than random soloingAABA gives you an obvious narrative:20.61Level 29 — melodic density by formA1: sparse.20.62Level 30 — register by formA1: middle.20.63Level 31 — rhythmic motif by formA1 motif: perhaps syncopated 3-note cell.20.64Level 32 — bridge sequence exerciseUse exactly:20.65Level 33 — chromatic enclosure on dominant thirdsD7 target F♯:20.66Level 34 — delayed resolutionOn F7 → B♭:20.67Level 35 — bridge as tension rampEach dominant can gain intensity:20.68Alternative: decrease intensityStart bridge strong.20.69Level 36 — chord-scale economyOn A sections in B♭:20.70Bridge economyFor each dominant:20.71Level 37 — anticipate the bridgeDo not wait for D7 to appear before realizing the bridge began.20.72Likewise anticipate returnWhile on F7 at end of bridge:20.73This is the core real-time skillBeginner:20.74Level 38 — practice without pianoSay aloud:20.75Level 39 — metronome on 2 and 4At medium swing tempo:20.76Level 40 — metronome once per barLater:20.77Level 41 — half-time practiceIf target performance is fast:20.78Tempo ladderFor example:20.79At high tempo, abandon unnecessary notesIf a voicing is too difficult:20.80Level 42 — one chorus with quarter notesNo eighth notes.20.81Level 43 — one chorus with restsEvery phrase must contain at least one full beat of silence.20.82Level 44 — bridge-only loopLoop the bridge for ten minutes.20.83Level 45 — A-section-only loopLoop one A section.20.84Level 46 — alternate original and substitute harmonyChorus 1: basic.20.85Level 47 — melody statement versus soloWhen playing the composed melody:20.86Level 48 — solo-piano textureAt a medium tempo:20.87IntroA natural intro is the A-section turnaround:20.88More dramatic introUse the bridge dominant chain:20.89EndingSimple:20.90Final tonicB♭6/9:20.91Homework A — memorize formWithout piano:20.92Homework B — bridge rootsPlay:20.93Homework C — bridge thirdsPlay:20.94Homework D — A turnaroundPractice:20.95Homework E — three A-section variantsPlay:20.96Homework F — motif bridgeUse one 3-note motif.20.97Homework G — full chorus, quarter notesOne full 32-bar chorus.20.98Homework H — full chorus, one motifA1: state.20.99Homework I — compingPlay with imaginary soloist.20.100Homework J — tempo ladderChoose a comfortable tempo.•Workshop 20 mini-test1. What is the fundamental form of Rhythm Changes?