Find C.

How it teaches

• 

  Repetition, spaced by questions — not by the clock. An answer comes back after 4 more questions, then 10, then 25, until you can't miss it. Practise five minutes a week or an hour a day; the course adapts either way.

• 

  Four tracks, one course. The core chain runs from the white keys to key signatures. Reading, recognition and connections open alongside it, so notation automates over months instead of waiting at the end.

• 

  A lesson before every concept. Plain language, a formula, and a worked example — taught the first time a concept comes up, and re-readable from any question.

The course

144 levels, 1,906 drillable items, one concept at a time. Each chapter opens when the one before it is truly grasped.

1. The keyboardL1–L3every key by name
2. DistancesL4–L12semitones to fifths, played and named
3. First chordsL13–L27major and minor triads, inside and out
4. ScalesL28–L42major and natural minor, degrees and spelling
5. InversionsL43–L54the same notes, rotated
6. Pentatonics and bluesL55–L66the five- and six-note scales
7. More chord coloursL67–L81diminished, augmented, suspended
8. Seventh chordsL82–L93dominant, major, minor, diminished
9. More scalesL94–L102harmonic and melodic minor
10. UnderstandingL103–L123modes, diatonic chords, key signatures
11. ReadingR1–R11both clefs, from notes to whole keys
12. RecognitionN1–N8keys light up — you name them
13. ConnectionsC1–C2relative keys and chord function

The lessons, free to read

All 57 lessons — the whole course as a book.

The deal

• Free. No subscription, no ads, no locked levels.
• No account. Progress lives on your device; an optional sync code keeps a cloud copy for your other devices.
• Works offline after the first visit, and installs like an app.
• Nothing is tracked. The whole privacy storyfits in four paragraphs.