A scale on the Scale Circle is a set of notes with one of them chosen as the centre. Move the centre to another note of the same set, and you get a different scale built from the very same notes. Scales related this way form a family.
That one idea makes the whole catalogue much friendlier than it looks. TerryTrilla knows 1 577 scales — but they are not 1 577 separate things to learn. They are 254 families, each one a set of notes you can read from several starting points.
A family is one set of notes, read from different centres
Take the seven white keys: C D E F G A B. Start on C and you have Ionian, the major scale. Start on D and those same seven notes become Dorian. Start on E — Phrygian, and so on:
| start on | scale |
|---|---|
| C | Ionian (Major) |
| D | Dorian |
| E | Phrygian |
| F | Lydian |
| G | Mixolydian |
| A | Aeolian (Natural Minor) |
| B | Locrian |
Seven notes, seven starting points, seven scales — and all of them belong to the Diatonic family.
Notice that nothing was added or taken away; only the centre moved. That is also what you see on the circle: the shape of the star stays the same while the tonic jumps to another ray. The star is described in Scale Circle: what it is and how it is built, and the › ‹ buttons walk exactly this path, one step at a time.
The number of scales in a family matches the number of notes
If a family has seven notes, there are seven notes to start from — so seven scales. Five notes, five scales. The catalogue follows this exactly:
| family type | notes | scales | families |
|---|---|---|---|
| pentatonic | 5 | 330 | 66 |
| hexatonic | 6 | 462 | 80 |
| heptatonic | 7 | 455 | 65 |
| octatonic | 8 | 330 | 43 |
The arithmetic works out: 65 families × 7 notes = 455 scales, 66 × 5 = 330. So the catalogue is not a long list of names to memorise — it is a grid, and you can find your way around it.
A few families break the pattern, and they are worth knowing
Look at the six-note row. If every family had six scales, there would be 480 of them, but the catalogue has 462. The eighteen «missing» ones have a good reason to be missing.
Some families are symmetrical: their notes repeat at a fixed distance. Rotate such a set and you land on exactly the same set — the «new» scale turns out to be the old one, so it is not counted twice.
| family | scales, instead of 6 (or 8) |
|---|---|
| Whole Tone | 1 |
| Augmented | 2 |
| Tritone | 3 |
| Two Semitone Tritone | 3 |
| Diminished (8 notes) | 2 |
Whole Tone is the clearest example: every step is a whole step, so wherever you begin, the pattern reads the same — W W W W W W. One family, one scale. The Diminished family alternates whole and half steps, which gives it exactly two readings rather than eight.
If you would like to see it for yourself, build a whole-tone scale on the circle and press ›: the centre moves, and the star stays exactly where it was.
What this gives you in practice
- Learning one family gives you all of its scales. Once the seven white keys sit comfortably under your fingers, Dorian and Mixolydian are not new material — they are the same material with a different home note.
- The Studio reads a scale, not a name. When it works out the scale of your melody, it finds the set of notes and the centre; the name comes afterwards. That is why the Key block shows the reading it settled on with the other readings beside it — those are the other members of the same family, and any of them may be the one you hear.
- Searching by family is often quicker than searching by name. If a melody feels «like minor, only brighter», you are usually inside a family you already know, one rotation away from it.
Read next
- The seven scales of the diatonic family — the seven scales of the diatonic family, one by one.
- Five, six, seven, eight notes: what each size gives you — five, six, seven, eight notes: what changes with each.
- Symmetrical scales: why Whole Tone has only one mode — symmetry in more detail, and why Whole Tone has a single scale.
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