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The problem it solves
You need a way to create surprise and prolong a phrase just when the listener already expects the ending, without breaking the tonal coherence.
Detailed theory
Key idea
Instead of the expected V → I, the deceptive cadence does V → vi.
vi (minor) shares two notes with I, so it replaces the tonic but avoids the sense of an ending.
Understand it
When the dominant (V) sounds, the ear has already prepared to arrive at the tonic (I): it is the resolution every cadence promises. The deceptive cadence exploits exactly this expectation and diverts it: instead of going to I, the dominant resolves to the sixth degree (vi), a minor chord.
In Roman numerals it is written V → vi. In C major: G major → A minor. It works because vi (A-C-E) shares two of its three notes with the tonic I (C-E-G): the C and the E. That is why the arrival sounds related to the tonic, but it is not the tonic: the definitive rest is missing.
The result is a surprise that keeps the coherence. The phrase does not close; it stays open and can continue. It is often used to extend a section before the real ending, which will come later with a genuine V → I.
An analogy: it is like a sentence that seems about to end and, on the final word, takes an unexpected turn that keeps you listening. The sentence stays alive instead of closing with a full stop.
Chord progression
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Compare the two resolutions of the dominant: V → I (expected, closes the phrase) and V → vi (deceptive, leaves it open). Notice that A minor shares the C and the E with C major.
How to recognise it
How it's written
It is written with Roman numerals at the end of a phrase as V → vi (instead of V → I). The V is major and the vi is written in lowercase because it is a minor chord.
How it feels
Wait for the ending and notice it does not come: after the dominant, the chord sounds related to the tonic but darker and without rest. That "almost, but not quite" feeling is the mark of the deceptive cadence.
Common mistake
Confusing the deceptive cadence (V → vi) with the authentic cadence (V → I): the first avoids the tonic, the second reaches it.
Thinking vi is a "wrong" chord: it is a deliberate substitution that shares notes with the tonic and keeps the key.
Try it
Play G major and, instead of C major, resolve to A minor: notice how the phrase stays open rather than closing.
Chain C – F – G – A minor and then play G – C: you will feel first the surprise (V → vi) and then the real closure (V → I).
On the instrument
Chord progression
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The deceptive cadence in C major: the dominant (V = G major) resolves not to the tonic but to the sixth degree (vi = A minor). Hear how the phrase stays open instead of closing.
Where it's used
- Prolonging a phrase
- Avoiding the ending with V → vi to give the music time to continue before the real closure.
- Creating surprise
- Breaking the expectation of resolution to the tonic while keeping the tonal coherence.
- Analysing cadences
- Recognising by ear and on the score the move V → vi against the expected V → I.
Examples
Chord progression
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The deceptive cadence used to extend a phrase: I – IV – V – vi avoids the ending and, afterwards, V → I closes it for real. The surprise of the vi buys time to continue.
Exercises
Is it a deceptive cadence?
Decide whether the dominant resolves deceptively to vi.
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0/7 answeredQuestion 1/7
To which chord does the dominant resolve in a deceptive cadence?