Five, six, seven, eight notes: what each size gives you

TerryTrilla · September 19, 2026, 8:33pm

Families differ not only in sound but in size: how many notes they hold. That number decides a great deal — how many scales the family contains, how much room there is between the notes, and what the scale is comfortable for. Here is what each size brings.

If the idea of a family is new, start with A scale family: one set of notes, read from different centres.

The four sizes in the catalogue

notes	families	scales	families you will recognise
5	66	330	Pentatonic, and pentatonic forms of the harmonic and melodic families
6	80	462	Blues, Whole Tone, Augmented, Prometheus, Tritone
7	65	455	Diatonic, Melodic Minor, Harmonic Minor, Harmonic Major, Double Harmonic, Neapolitan Minor, Neapolitan Major
8	43	330	Diminished, Bebop Major, Bebop Dominant, Bebop Dorian

Most families in each group carry systematic names — Pentatonia 1, Hexatonia 12, Heptatonia Omega and so on. Those are the complete set of possibilities for that number of notes; the named families are the ones musical practice has settled on.

Five notes: room to breathe

Take seven notes and remove the two that create half steps, and the scale loses its sharpest tensions. What remains is a pentatonic: five notes, wide steps, and very few ways to sound wrong over a chord.

That is exactly why guitarists meet the minor pentatonic first. It is forgiving — and its forgiving nature is a property of the intervals, not a beginner’s discount.

The catalogue holds 330 pentatonic scales in 66 families, and they are not only the familiar two: there are pentatonic forms drawn from harmonic minor, harmonic major, the Neapolitan families and others. If the usual pentatonic starts to feel narrow, that is where to look next.

Six notes: the character scales

Six-note families are where the most distinctive colours live. Blues belongs here — the minor pentatonic with the blue note added back. So do Whole Tone and Augmented, which sound unlike anything diatonic because their steps are perfectly even.

This group is also the largest by family count — 80 — and the one where the neat arithmetic breaks: five of those families are symmetrical and contain fewer scales than their size suggests. That story is worth its own article: Symmetrical scales: why Whole Tone has only one mode.

Seven notes: the working material of harmony

Seven notes give you a triad on every degree and a seventh chord on every degree — which is why harmony as it is usually taught lives here. The Diatonic family is the centre of it, and the other six named families are the well-known departures: raise the seventh of minor and you have Harmonic Minor; raise the sixth as well and you have Melodic Minor.

455 scales in 65 families. For most everyday work, the named seven cover it; the systematic families are there when you go looking for a colour on purpose.

Eight notes: passing tones built in

An eight-note scale has one more note than there are degrees in common harmony, and that spare note usually works as a passing tone. The Bebop families are exactly this: a seven-note scale with one chromatic note added so that chord tones land on strong beats when you run the scale in eighths.

Diminished is the other well-known member — strictly alternating whole and half steps, and symmetrical, which is why it has two scales rather than eight.

Which size to reach for

There is no ranking here, only different room to move:

fewer notes — fewer ways to clash, more space in the sound;
more notes — more colour and more passing tones, and more care needed about where they land.

In the Studio the choice is usually made for you: it reads the scale from your melody. But when you want to try something on purpose, the number of notes is a good first filter — and the Circle lets you switch between families without losing your place.