Music counts to twelve and starts again, just like a clock. Step round by ones and twos and watch the pattern of a major scale appear.
Music counts to twelve and then starts again, exactly like a clock face. One step round is a semitone. Two steps is a tone. Skip round in the right pattern and a major scale appears.
Tap any note on the circle to start from there.
take a step — and listen
started on C · walked +0 steps · now on C
Keep going. Twelve steps gets you back to the note you started on.
the Scale Rule
2 + 2 + 1 + 2 + 2 + 2 + 1 = 12
Seven steps, and they add to twelve — a whole lap of the circle. That is why the eighth note of a scale has the same name as the first one.
the small numbers are how many steps you have taken so far: 0, 2, 4, 5, 7, 9, 11, 12
From the NSM syllabus
Counting in twos round the circle — 0, 2, 4, 6, 8, 10 — hits only half the notes and gets you home after six jumps. Counting in ones takes twelve. Same circle, different stride.
Nobody memorises twelve separate scales. You memorise one pattern — 2, 2, 1, 2, 2, 2, 1 — and start it anywhere on the circle. That is what a rule is for.
Pass twelve and the names start again, just as a clock passes 12 and returns to 1. The note sounds higher, but it wears the same name.
For the classroom