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The problem it solves
You need to understand why certain progressions 'demand' to resolve and which way they lean: it is the dominant function that creates this pull toward home.
Detailed theory
Key idea
The dominant function (D) creates the strongest tension and pulls toward the tonic.
Its main chord is V (often V7); it contains the leading tone, the 7th degree, which resolves a semitone up to the tonic.
Understand it
Within the play of functions, the dominant (D) is the tension: the chord that does not feel stable and that calls to move to the tonic. In C major, the dominant chord is G major (V), built on the fifth degree of the scale.
The dominant's strength comes from one note: the leading tone (the seventh degree, B in C major), which is only a semitone from the tonic and tends to 'fall' onto it. When the dominant carries a seventh (V7 = G7), that seventh (F) adds even more tension and resolves by stepping down to E.
The motion from dominant to tonic (D → T, that is V → I) is the engine of cadences: it is the formula by which tonal music generates and resolves tension. The chord vii° (on the seventh degree) also acts as a dominant because it shares the leading tone and the same pull toward the tonic.
An analogy: the dominant is like a stretched spring or a question left hanging. It holds energy that points clearly toward one place —the tonic— and does not come to rest until it arrives there.
Interval distance
The dominant's engine: the leading tone (B, the 7th degree) is only a semitone from the tonic (C) and 'falls' onto it. This pull is what gives the dominant function its direction.
How to recognise it
How it's written
It is written with the Roman numeral V in upper case (a major chord on the fifth degree), often with a 7 if it is a dominant with a seventh: V7. The leading-tone chord is written vii° with the diminished symbol.
How it feels
Listen for the chord that 'demands' to continue and does not let you rest: this directed tension is the dominant function. It sounds like a question awaiting an answer or a push forward.
Common mistake
Thinking the dominant is an ending: it is quite the opposite, it is tension that demands to resolve to the tonic.
Forgetting that the dominant force comes from the leading tone (the 7th degree) and, in V7, from the seventh: these notes are what create the pull.
Try it
Play G major (V) and stop: you will notice the music is left "hanging" and asks to go to C.
Now play G7 → C (V7 → I) and notice how the leading tone B rises to C and the seventh F drops to E: the resolution feels inevitable.
On the instrument
Chord progression
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In C major, the dominant (V = G major) creates tension and pulls toward the tonic (I = C major). Listen to how the first chord asks and the second answers.
Where it's used
- Closing phrases
- Preparing a convincing resolution toward the tonic with V → I.
- Creating motion
- Generating direction and push in a progression that sounded static.
- Reinforcing tension with V7
- Adding the seventh to the dominant to make the resolution even more inevitable.
Examples
Chord progression
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The dominant with a seventh resolving to the tonic: G7 (V7) → C (I). The seventh (F) and the leading tone (B) add tension that resolves to C major.
Exercises
Identify the dominant (V)
Listen to a chord sequence and pick the one that creates the most tension.
Complete 6 attempts · 70% accuracy to pass
Mini test
Check that you've got it.
0/7 answeredQuestion 1/7
Which sensation defines the dominant function?