A short course built around five engines — the underlying patterns that produce almost everything you need to know at Grade 4 level. No lists. No memorisation by rote. Just the machinery behind the music.
Not sure where you sit?
Take the 2-minute Quick placement check.
Most courses hand you a pile of facts to memorise — this key has two sharps, that chord has those notes — and hope it eventually clicks. Tonic does the opposite. It teaches the five engines: the small set of underlying patterns that generate almost everything you need up to Grade 4. Learn the engine and the facts fall out of it. You derive, instead of memorise.
Patterns, not flashcards
Five ideas do the heavy lifting. Once they land, new keys, chords and scales stop being things to memorise and become things you can work out.
Hear everything, instantly
Every keyboard, scale and chord is playable. Tap to hear it — because hearing the pattern is half of understanding it.
Play with the structures
Sixteen interactive explorers let you slide, rotate and rebuild the ideas yourself — watch the circle of fifths build itself, hear the four cadences side by side, see a scale shape move across every key.
Written for an adult
Plain, honest prose that explains the why. No talking down, no padding, no exam-cram tone. Just the machinery, clearly laid out.
Know where your gaps are
Two tests score you by area, not just a single mark — so you see exactly which engine to revisit.
Free, private, no fuss
No account, no sign-up, no ads. What it remembers is saved only in your own browser.
Two Learning Paths
Essentials from scratch, or Advanced for Grade 4 depth — same ideas, different pace.
Playable keyboard
Three octaves, every key labelled, every note audible.
16 explorers
Intervals, scales, chords, the circle, rhythm, transposition and more.
Metronome & rhythm tools
Real time-signature feel, simple and compound, tap tempo.
Two graded tests
Essentials and ABRSM Grade 4, scored by area.
Placement check
Two minutes to find the right starting point.
Tonic is for a musician of any instrument — guitar, violin, voice, trumpet, anything — who wants to build real music-theory understanding. The concepts here are universal; they belong to music, not to one instrument.
The examples and interactive widgets are built around the keyboard, simply because it is the clearest way to see how theory works — pitches laid out in a line, intervals you can measure with your eyes, chords you can stack and see. You do not need to play piano to use any of it.
A few honest clarifications
This is not a piano-learning app. It will not teach you to play, and it will not make you a Grade 4 pianist. It builds the theory that underpins becoming a stronger musician on whatever instrument you play.
When we mention “Grade 4” or similar, we mean the music-theory level — not an instrumental grade. They are separate systems. Theory knowledge at this level is a prerequisite for becoming a stronger player, and in the ABRSM system a Grade 5 Theory pass is required before you can take Grade 6–8 practical exams on any instrument.
A handful of questions point you to Essentials or Advanced — try it here.
Each section builds on the last. Use the Menu any time to jump back to a topic.
When a concept links to an explorer, open it, slide it around, and hear it. That's where it really lands.
The per-area score shows what to revisit. No need to wait until you've finished.
Tonic remembers where you've been, so you can dip in and out.
The Essentials test covers the five-engine foundations across 20 questions. The Advanced test covers the seven areas of the ABRSM Grade 4 exam across 30 questions. Both score you by area so you can see precisely where any gaps remain — and both are always available from the Menu.
Everything Tonic teaches — major and minor scales, functional harmony, key signatures, the circle of fifths — is the system that dominated Western European music from roughly 1600 to 1900, the “common practice” period. It is grounded in the physics of sound, which is why it feels so inevitable once you understand it — but it is also a cultural construct: a set of conventions a tradition agreed on, not a law of nature.
Other traditions have built equally sophisticated pitch systems from the same acoustic raw material:
These are not primitive versions of the Western system — they are different systems, each internally coherent. Tonic teaches one of them thoroughly, because it underlies the widest range of music you are likely to meet in a Western context. Knowing it well is the foundation for understanding why the others sound the way they do.