Chord builder
Build seventh chords and tensions by stacking thirds. Listen to the result and explore the corresponding chord scale.
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Jazz harmony Learn interactively.
Hear, see and sing intervals, chords, voicings, the circle of fifths and II–V–I progressions.
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Bebop scale
Hear how a chromatic passing note keeps chord tones on the beat throughout a continuous stream of eighth notes.
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Blues forms
Hear basic, quick-change, jazz and Bird blues as twelve-bar grids with looping playback and scale-degree labels.
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Coltrane changes
Explore the major-third cycle of Giant Steps: three equally spaced tonal centres represented by an audible 3D triangle.
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Frequency spiral
Explore intervals on a logarithmic frequency spiral. Listen to frequency ratios and compare just intonation with equal temperament.
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II–V–I generator
Hear II–V–I progressions in every key and follow animated guide-tone voice leading from the seventh to the third.
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Interval trainer
Hear and identify musical intervals, then sing them into a microphone and receive pitch feedback measured in cents.
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Sing the line: solfège
Listen to scales, triads, II–V–I or bebop lines and sing them into a microphone for pitch feedback in cents.
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Modal interchange
Borrow chords from parallel modes, identify their source and hear them in context.
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Mode wheel
Explore the seven modes as rotations of a major scale, comparing characteristic notes, semitone patterns and sound.
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Circle of fifths in 3D
Explore keys, key signatures, relative keys and II–V–I progressions on a 3D wheel, with sound.
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Reharmonisation lab
Hear the same melody over new changes using tritone substitutions, inserted II–V progressions, diatonic substitutions and pedal points.
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Rhythm clapping
Clap rhythm patterns into a microphone alongside a metronome and inspect timing feedback in milliseconds.
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Secondary dominants
Hear tonicisation through secondary dominants, resolution arrows and related II–V progressions.
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Swing and time feel
Compare straight and swung eighth notes. Move the offbeat into a triplet grid with a swing-ratio control and audible ride cymbal.
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Tension and release curve
Follow a chord progression as a curve of musical tension: dominants build tension and the tonic resolves it, synchronised with playback.
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Tensions and avoid notes
Explore chord tones, available tensions and avoid notes. Listen to each scale degree against the underlying chord.
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Tritone substitution
Compare G7 and D♭7 through their shared guide tones and chromatic bass motion. Listen to original and substituted progressions.
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Turnaround lab
Loop common two-bar turnarounds, including I–vi–ii–V, tritone substitutions and Lady Bird changes, while following their voice leading.
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Voicing lab
See and hear close, drop-2, drop-3, rootless, quartal and shell voicings on a piano keyboard.
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