Questions: Dominant Seventh: Function and Resolution

Question 1

In a V7→I resolution in C major, the G7 chord (G–B–D–F) resolves to C major (C–E–G). What happens to the tritone B–F inside the G7?

• A. B moves down by half-step to A♯ and F moves up by half-step to F♯
• B. B moves up by half-step to C and F moves down by half-step to E
• C. Both B and F resolve by leap to G, the fifth of the tonic
• D. The tritone dissolves because F is typically omitted in the resolution

Answer: (B)

The tritone B–F resolves by contrary half-step motion: B (the leading tone) moves up by half-step to C (the tonic), and F (the chordal seventh) moves down by half-step to E (the third of the tonic chord). This is the built-in 'gravity' of the dominant seventh — each voice is one half-step away from its resolution target. The physical inevitability of these two half-step resolutions is what gives V7→I its strong sense of arrival. Resolving both voices by leap (option C) or omitting F (option D) would undercut the tension-release effect.

Question 2

A musician hears an unfamiliar chord with a distinctive 'pulling' quality that makes the next chord feel inevitable. Which interval inside the chord is primarily responsible for this directional tension?

• A. The major third between the root and third — it defines the chord as major
• B. The perfect fifth between root and fifth — it gives the chord stability
• C. The tritone between the third and seventh — it is maximally dissonant and resolves by half-step
• D. The minor seventh between the root and seventh — any seventh chord creates functional tension

Answer: (C)

The tritone (augmented fourth / diminished fifth) is the most dissonant interval in standard tonal practice and has a uniquely strong tendency to resolve. In the dominant seventh chord specifically, the tritone sits between the third and seventh — the two voices that resolve by half-step contrary motion to the tonic. The minor seventh alone (option D) does create some tension, but it's the tritone that gives V7 its distinctive, directional pull that other seventh chords lack. A major seventh chord also has a seventh but sounds very different — because it has no tritone.

Question 3

The strong sense of resolution when V7 moves to I is caused by both notes of the tritone resolving outward by half-step to the tonic chord's root and third.

• T. True
• F. False

Answer: True

Yes: B (third of G7) resolves up by half-step to C (root of I), and F (seventh of G7) resolves down by half-step to E (third of I). Both voices move by the smallest possible interval — a half-step — in contrary motion. This dual half-step resolution is the physical source of V7's gravitational pull toward I, and it is the template on which all secondary dominants in tonal music are built.

Question 4

Any chord that sounds tense or dissonant will naturally resolve to the tonic (I) chord.

• T. True
• F. False

Answer: False

Tension and dominant function are not the same thing. Many chords can sound tense or dissonant — a diminished seventh, an augmented chord, a chord with added non-chord tones — without containing the specific tritone that drives V7→I resolution. Functional harmony means V7 specifically pulls toward *its* tonic because its tritone has a built-in half-step resolution to the notes of that tonic chord. A diminished seventh chord, for example, is ambiguous — it can resolve to multiple different 'tonics' depending on context. The dominant seventh's function is specific, not merely a product of dissonance.

Question 5

What makes the V7→I resolution feel more 'inevitable' than, say, a IV→I resolution? Explain in terms of what is happening inside the V7 chord.

Model answer: The V7 chord contains a tritone (between its third and seventh) that resolves by half-step contrary motion to the root and third of the I chord. Both voices are one half-step from their targets, creating strong voice-leading gravity. The IV chord has no such internal tension — it is a stable major triad, and its motion to I is a 'relaxing' step down rather than a resolution of internal dissonance. V7 is functionally directed toward I in a way that IV is not; the tension is built into the chord's interval structure, not just its position in the scale.

The key is that V7 has a built-in 'arrow' pointing toward I: the tritone's two voices each want to move somewhere specific. IV→I (the plagal cadence) is a gentle relaxation with no dissonant interval demanding resolution. This is why V7→I is called an 'authentic cadence' — it is the strongest, most conclusive ending in tonal music, while IV→I is softer and sometimes called the 'church cadence' or 'amen cadence.'