What makes the dominant seventh chord (G7) more harmonically powerful than the dominant triad (G major)?
AThe added seventh makes the chord louder and more prominent in the texture
BThe seventh creates a suspension that delays resolution, building anticipation
CThe seventh adds a tritone between the third (B) and seventh (F), where B pulls up to C and F pulls down to E — both resolving by half step simultaneously toward the tonic chord
DThe fourth note increases harmonic mass, which strengthens gravitational pull toward the tonic
The dominant seventh's power is specific: it is the tritone formed between the third and seventh of the chord (B and F in G7) that creates irresistible momentum. B is the leading tone, wanting to resolve up by half step to C (the tonic). F is the seventh, wanting to resolve down by half step to E (the third of the tonic chord). These two voices squeeze inward simultaneously in contrary motion, making V7–I the strongest, most conclusive harmonic gesture in tonal music. A mere triad has only the leading-tone pull; V7 adds the downward pull of the seventh, doubling the resolution force.
Question 2 Multiple Choice
A Cmaj7 chord appears at the end of a jazz ballad as the final chord. A G7 chord appears just before the final tonic in a Bach chorale. Which best describes the difference in their function?
ABoth are unstable chords requiring resolution to a more stable harmony
BCmaj7 is primarily coloristic — adding richness and warmth to a stable resting point; G7 is primarily functional — its tritone creates urgent tension demanding resolution
CCmaj7 is a weaker version of G7 because major sevenths are less dissonant and therefore less effective
DBoth function identically; the difference is purely stylistic between jazz and classical contexts
The distinction between coloristic and functional sevenths is the key analytical insight. The major seventh in Cmaj7 (the interval C to B) is a lush, wide interval that adds sophistication without creating urgent harmonic tension — it enriches a stable moment rather than destabilizing it. G7's minor seventh (G to F) contributes to the tritone between B and F, which *does* create urgent tension. Cmaj7 is a final resting place with added color; G7 is an unstable pivot demanding resolution. Treating them as equivalent (option D) misses the functional difference that makes V7 drive harmonic motion while Imaj7 doesn't.
Question 3 True / False
In the dominant seventh chord G7 (G–B–D–F), the note B wants to resolve upward by half step and the note F wants to resolve downward by half step, because they form a tritone together.
TTrue
FFalse
Answer: True
Exactly right. B is the leading tone of C major — by definition it pulls up to C, the tonic, by half step. F is the minor seventh of G7; in the context of G7 resolving to C major, F moves down by half step to E, the third of the tonic chord. These two resolutions happen simultaneously in contrary motion — B moves up while F moves down — and their combined pull is what gives V7 its characteristic urgency. The tritone (three whole steps = six semitones) is the most dissonant interval in tonal music, and its resolution is what drives V7–I.
Question 4 True / False
Adding a seventh interval to any triad creates the same kind of urgent harmonic tension as the dominant seventh chord.
TTrue
FFalse
Answer: False
The type of tension created depends entirely on the specific interval formed. The dominant seventh chord's urgency comes from the tritone between its third and seventh — a specific dissonance demanding resolution. A major seventh chord (e.g., Cmaj7: C–E–G–B) adds a major seventh interval, which is wide and lush rather than dissonant. It creates color and warmth without the urgent pull of a tritone. A minor seventh chord (Dm7: D–F–A–C) adds a minor seventh to a minor triad, creating a cooler, understated sound also lacking tritone tension. The V7's power is special, not generic to all seventh chords.
Question 5 Short Answer
Explain why the dominant seventh creates 'irresistible harmonic momentum' toward the tonic, using the specific behavior of each note in the chord.
Think about your answer, then reveal below.
Model answer: G7 contains G (root), B (major third / leading tone), D (fifth), and F (minor seventh). B is the leading tone of C major and pulls up by half step to C. F is the seventh and pulls down by half step to E (the third of the C major chord). D moves to C or E with smooth voice leading. The root G moves to C by fourth. But the crucial drivers are B and F: they form a tritone, the most dissonant interval in tonal music, and both want to resolve by half step in opposite directions simultaneously. This dual half-step resolution in contrary motion creates the irresistible sense of arrival on the tonic.
Understanding V7 means understanding the tritone resolution specifically, not just that V7 is 'more tense' than V. The leading tone pull (B→C) existed already in the dominant triad. The seventh (F) adds a second voice pulling in the opposite direction, doubling the resolution force. This is why V7–I is the strongest harmonic gesture in tonal music and why the tritone was historically called diabolus in musica — its dissonance and its powerful resolution were both recognized as remarkable.