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"Tonality" is often treated as a synonym for "key signature", which it is not. A key signature states which notes are in use; tonality states that one of them is home, and that the others are measured against it by distance and tendency.
Without a centre, a scale is only material. With one, the same notes become tonal music.
How a centre gets established
A tonic is not established by playing it first, but by three means acting together:
| Means | How it works |
|---|---|
| cadence | a dominant-to-tonic motion declares "this is home" (see [[concept:cadence |
| repetition and emphasis | the tonic recurs on strong beats, in long notes, and at phrase ends |
| harmonic function | every other chord acquires its function relative to the tonic (see [[concept:harmonic-function |
Stack the three and the listener automatically hears one pitch as the centre. The process is tonal establishment.
Move the centre and you have modulation
The centre can shift: confirm another area often enough and the sense of gravity moves (see modulation). This is exactly what allows tonal music to be long — the same notes can carry different centres, which gives a piece a map.
How it differs from mode and scale
The three are often conflated, but each asks a different question:
| Concept | The question |
|---|---|
| scale | which notes are used? |
| mode | what pattern do they form? |
| tonality | around which note do they turn? |
So "I am playing C Dorian" (mode) and "this passage is centred on C" (tonality) are different statements: the first describes material, the second describes organisation.
Diagram: how a centre gets surrounded
Listen: where the sense of centre comes from
Hear a major scale through the scale component (a centre exists, but a weak one), then consider how much stronger it becomes once a dominant-to-tonic motion is added. A centre is not built into a scale; it is confirmed.
Common misconceptions
- "Tonality means the key signature." The signature states which notes are used; tonality states what they turn around. One signature can serve several modes and different centres.
- "Playing the tonic first establishes the key." One appearance is not enough; cadence, repetition and function must confirm it together.
- "No signature means no tonality." There are many counterexamples: an empty signature can be heard as C major, A minor or a mode.
- "Tonality is obsolete." The twentieth century did produce atonality and pantonality, but pop, jazz and film scoring remain largely tonal.
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Listen in the library
All tracks from midicn-lib — inline badge is the license tier (C1 commercial / C2 non-commercial / C3 study only).
Sources
- 调性指以一个中心音（主音）为基准组织音高与和声的体系，属和声学通则
- 调性的建立依赖终止式、属—主关系与重复强调，为通行和声学表述
Used for fact-checking only; all prose is original.