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The step where key hearing most easily goes wrong is looking for "which notes are used". The right first question is another one:
Where is the centre?
Because a pitch set cannot determine a key: C major and A minor share the same notes (the core conclusion under key signature) — so "hearing which notes are used" does not answer "what key is this".
The cheapest test: the third above the tonic
| Test | Conclusion |
|---|---|
| a major third above the tonic | major mode |
| a minor third above the tonic | minor mode |
Why it is the cheapest: it requires confirming only two notes (the tonic and the third), and those two decide the mode's basic colour. The other degrees (sixth, seventh) are variants on that basis:
| Variant | Change |
|---|---|
| harmonic minor | the seventh degree raised (to obtain dominant function) |
| melodic minor | the sixth also raised going up |
| Dorian, Mixolydian and others | the sixth or seventh adjusted to the mode |
So the order is: find the tonic → hear the third → then note the sixth and seventh.
How to find the centre
The centre is not a "feeling"; it is established by three things:
| How | Explanation |
|---|---|
| cadences | the strongest means of establishing a centre (see [[concept:cadence\ |
| repetition and emphasis | the note that occurs most, and longest, is often the tonic |
| the beginning and the end | the overwhelming majority of works end on the tonic |
The third row is the most practical shortcut: listen to the last note — it is most likely the tonic (see tonal centre).
The first is fundamental: without a cadence the centre becomes vague — which is exactly why much modern music "has no audible key".
Three cases of "no audible key"
| Case | Cause | Can you judge? |
|---|---|---|
| vague centre (e.g. Impressionist) | traditional cadences avoided | often "roughly centred on some note", but not definite |
| frequent modulation | the centre keeps changing | yes, section by section |
| atonality | the centre deliberately removed | no — there is no centre to find |
The second is common: Romantic works often pass through several keys within a minute. Then do not ask "what key is this" but "what key is this passage in" — the unit of judgement follows the scale of the music.
Diagram: the test is the centre, not the pitch set
Listen: one pitch set, two centres
Use scale on two scales — the same notes (C D E F G A B) but one centred on C and one on A. Notice which note carries the sense of arrival.
Common misconceptions
- "Knowing the notes tells you the key." It does not. Relative major and minor share a pitch set; the centre
- "Key is a matter of feeling." There are concrete means: cadences, emphasis, and the beginning and end.
- "Minor means sad." That is a stereotype. Minor keys have no fixed emotional meaning (see
- "Not hearing a key means poor ears." Some music has no centre (atonality); **failing to find one is
must be judged.
correct**. :::
Listen in the library
All tracks from midicn-lib — inline badge is the license tier (C1 commercial / C2 non-commercial / C3 study only).
Sources
- 调性中心感由终止式、重复与强调共同建立；大小调最省力的判据为主音上的三度性质，为通行练耳教学表述
- 关系大小调共用同一音集，故"音集"不能判定调性，为通行乐理表述
Used for fact-checking only; all prose is original.