TerryTrilla

The geometry of sound

Learn music theory by seeing it.

Scales become shapes, chords light up where they live, and modes spin around one bright constellation.

1,247scales
200+chords
6languages
iDmIVG7iiEm♭IIIFvii°C♯°viBm
Ionian𝄞Dorian𝄞Phrygian𝄞Lydian𝄞Mixolydian𝄞Aeolian𝄞Locrian𝄞Harmonic minor𝄞Melodic minor𝄞Ionian𝄞Dorian𝄞Phrygian𝄞Lydian𝄞Mixolydian𝄞Aeolian𝄞Locrian𝄞Harmonic minor𝄞Melodic minor

Why visible

Theory you can see, not just memorize.

Three ideas do most of the work in music theory. TerryTrilla turns each one into a picture.

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Scales become shapes

Every scale draws a unique star polygon on the circle. Symmetric, pentatonic, modal — you read the type at a glance.

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Transposition is rotation

Spin the ring and the shape stays — only the key changes. The same fingering logic, every tonic.

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Chords live inside scales

Tap a chord and its notes light up where they already sit in the scale. Harmony stops being abstract.

Scale Circle

Piano

Guitar fretboard

Notation

One synced environment

Change the scale once — everything answers.

Pick a scale and watch the circle, keyboard, fretboard and staff move together — and its diatonic chords rebuild instantly.

D DorianC MajorA MinorF LydianE Phrygian
iDmiiEmIIIFIVGvAmvi°B°VIIC

Hear it move · ii — V — I in D Dorian

iDmIVGVIICiDm
Major Pentatonic♫Blues♫Whole Tone♫Hungarian Minor♫Dorian ♭2♫Phrygian Dominant♫Lydian ♯2♫Bebop Dominant♫Major Pentatonic♫Blues♫Whole Tone♫Hungarian Minor♫Dorian ♭2♫Phrygian Dominant♫Lydian ♯2♫Bebop Dominant

A complete toolbox

Real instruments, not screenshots.

Every tool is interactive and synchronized — sound on, theory underneath.

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Scale Circle

The crystal — scales as shapes.

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Piano

Two octaves, every key lit.

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Fretboard

Any tuning, the scale mapped.

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Notation

Live staff, real noteheads.

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Tuner

Hear and see the pitch.

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Metronome

Keep time, stay in the pocket.

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Chord Chart

Voicings across the neck.

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Mode Matrix

Seven modes, side by side.

Built for the people who teach it

Two ways to make it yours.

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For teachers

A visual teaching tool

Run a classroom where forty students see the same circle.

Assign quests and exercises that check the answer automatically.

Track progress per student, per scale family.

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For creators

Creator Partner Program

Ship your own Creator’s Lab preset of the Scale Circle.

Earn a revenue share on every learner you bring.

Embed live widgets in posts, lessons and videos.

Coming soon

Live Lessons

Not Zoom with a shared screen — a live interactive instrument.

Teach or learn in a real-time room where the Scale Circle is synchronized for everyone. Rotate the scale on your side and it turns on theirs. Built on LiveKit, arriving soon.

Coming soon

Teacher

Ana

Yuki

ii — V — I♩I — vi — IV — V♩i — ♭VII — ♭VI — V♩I — V — vi — IV♩ii° — V — i♩ii — V — I♩I — vi — IV — V♩i — ♭VII — ♭VI — V♩I — V — vi — IV♩ii° — V — i♩ii — V — I♩I — vi — IV — V♩i — ♭VII — ♭VI — V♩I — V — vi — IV♩ii° — V — i♩ii — V — I♩I — vi — IV — V♩i — ♭VII — ♭VI — V♩I — V — vi — IV♩ii° — V — i

An unusually deep catalog

The whole map of tonal music.

1,247scales
211scale families
200+chords
6languages

See the geometry.
Hear the difference.

Free to start. No credit card required. Available in 6 languages.