Jazz Harmony Studio
Extended and altered chords, ii–V–I in all twelve keys, voicings on keyboard and guitar, and ear training for extensions.
What it trains
Jazz Harmony Studio works with the chords that go beyond the seventh: 9ths, 11ths and 13ths, altered dominants, and the voicings players actually use. It plays ii–V–I progressions in every key with smooth voice leading, asks you to spell and build these chords, and trains you to hear which extension is on top.
- Spelling extended and altered chords correctly, such as E♭7♯9 or B♭13♯11
- ii–V–I progressions in all twelve major and minor keys
- Shell and rootless voicings on the keyboard, and shell and drop-2 voicings on guitar
- Hearing chord extensions (9, ♭9, ♯9, ♯11, 13, ♭13) and extended chord qualities
Exercises
- Spell the chord
- Enter the notes of an extended or altered chord from the root up.
- Extensions by ear
- Hear a dominant chord with one extension on top and name the extension.
- Chord quality by ear
- Hear a seventh or extended chord and name its quality.
- ii–V–I in every key
- Pick the ii–V–I that belongs to a given major or minor key.
- Build the voicing
- Press the keys of a shell or rootless voicing for a chord in a ii–V–I.
What makes it a Studio Edition
Compared with the Foundations tools, this edition asks more of you in concrete ways:
- Harder material
- Extended and altered chords contain five to seven notes with double sharps and flats in many keys — far beyond the triads and seventh chords of the Foundations tools.
- Real voicings
- Rootless and shell voicings move through ii–V–I progressions with smooth voice leading in every key, and the voicing drill asks you to build them yourself.
- Finer ear training
- Instead of telling major from minor, you pick out which single extension colours a dominant chord.
Try it
A short interactive demo built from the same code as the real tool.
Settings you can change
- Chord families included in spelling and ear training
- Extensions included in the extension drill
- Major ii–V–I, minor ii–V–I or both
- Voicing type: shell, rootless A or rootless B
- Tempo and tone for ii–V–I playback
- Key difficulty and session length
Instruments and clefs
Piano keyboard, guitar fretboard (six tunings, left-handed option), and treble and bass staff.
Reference view
A chord explorer spells any extended or altered chord on any root, on staff, keyboard and fretboard. A ii–V–I player runs through all twelve keys with your chosen voicing.
Who it’s for
- Players moving into jazz harmony who know their triads and seventh chords
- Pianists learning rootless voicings and guitarists learning shells and drop-2 shapes
- Anyone who wants to hear the colour each extension adds
Who it isn’t for
- Players new to seventh chords — start with Chord Builder & Ear Trainer
- Anyone looking for transcriptions, licks or tunes
What you need
- A modern web browser on a computer, tablet or phone
- Speakers or headphones
- The ability to hear audio — this tool includes ear training that depends on listening
About the sound: all instrument sounds are synthesized in your browser. They are not recordings of real instruments.
In every tool
- Instant feedback on every answer, with ✓ and ✗ marks and the correct answer shown.
- Settings that save themselves, plus named practice sets you can switch between.
- A session summary when you finish, with your accuracy and the items to review.
- A reference view for looking things up without being quizzed.
- Progress and streaks: accuracy over time and your weakest items, stored only on your device.
- Progress backup: move your progress to another device with a backup code or file.
- Works offline once unlocked, and installs to your home screen or desktop.
- Keyboard shortcuts, visible focus, a larger-interface setting, and dark mode.