A scale is the seven notes a piece mainly draws from, picked out of the twelve available. Which seven you pick is what decides whether the music sounds bright or aching.
There are twelve notes on the keyboard, but a single piece almost never uses all twelve equally. Normally you pick seven and work inside them. That choice is the scale.
The major scale — the bright spacing
Start on C and walk up the white keys only, and you get the sound everyone knows as "do re mi fa sol la ti do". That is the C major scale. Press the highlighted keys below in order.
The notes a piece mainly uses, written out low to high. The question it answers is which seven of the twelve you are working with.
The minor scale — the aching spacing
Now start on A and again walk up white keys only. Exactly the same keys as before, and the sound turns wistful. That is the A minor scale.
The reason identical keys give a different impression is that home moved. Measured from C, the pattern of gaps is the bright one. Measured from A, the same gaps line up as the dark one. It is not the notes themselves — it is the pattern of distances from home.
Hear it as a melody
- Starting on C (bright)
C | G | Am | F
- Starting on Am (dark)
Am | F | C | G
Same comparison as chapter one, except now it can be explained. Starting on C puts the bright spacing at the centre; starting on Am puts the dark one there. That is why four unchanged chords swap their character.
- Note names run out after seven and start again.
- Length and note count shape the impression as much as pitch.
- The time signature sets how the music walks.
- Bright and dark come from spacing, not from mood.
That closes part one. Part two opens up what is inside a chord. Before you go, write something over the darker progression.
Generate on the Am progressionBright and dark are not moods you impose — they come from the spacing of the steps, and from which note you treat as home.