Questions: Primary Harmonic Functions: Tonic, Subdominant, Dominant

Question 1

Why does the V7–I progression feel more harmonically final and conclusive than the IV–I progression?

• A. Because V is built on a higher scale degree than IV, giving it more energy
• B. Because V7 contains two tendency tones — the leading tone and the seventh — that converge by half-step onto the root and third of I
• C. Because IV is a minor chord in most keys, and minor chords cannot produce resolution
• D. Because IV–I violates voice-leading rules and is therefore avoided in tonal music

Answer: (B)

The dominant seventh chord's power comes from its specific internal structure. In C major, V7 = G–B–D–F. The leading tone B (scale degree 7) sits a half-step below C and pulls strongly upward; the seventh F sits a half-step above E and pulls downward. These two voices converge on C and E — the root and third of the tonic chord. This double half-step resolution is the acoustic engine of tonal closure. IV–I is a 'plagal' cadence that feels softer because IV lacks tendency tones with this kind of directional pull toward I. IV moves away from home and returns, but without the urgency that the leading tone creates.

Question 2

A piece in G major uses the sequence G – C – D – G repeatedly. A student identifies the C chord as creating the most intense tension demanding resolution. Is this correct?

• A. Yes — the C chord (IV) is the subdominant, which creates the greatest tension in tonal music
• B. No — it is the D chord (V) that creates the strongest tension and most urgent pull back to G
• C. Yes — because C major is a bright, energetic chord that creates maximum harmonic contrast with G
• D. No — in G major, neither C nor D creates tension; only the vii° chord does

Answer: (B)

The student has confused subdominant and dominant functions. The C chord is IV — the subdominant — which creates departure and openness, but not the urgent tension that demands resolution. The D chord (V) is the dominant — the engine of tonal motion — which contains the leading tone F# pulling upward to G, creating the strong expectation of return. The sequence G–C–D–G traces exactly the I–IV–V–I arc: home, departure, tension, resolution. Mistaking C for the tension-creating chord confuses the 'moving away' function with the 'demanding return' function.

Question 3

The tonic chord (I) is stable and resolves tension — it is the 'home base' that music departs from and returns to.

• T. True
• F. False

Answer: True

This is the defining characteristic of the tonic function. The tonic does not create tension; it relieves it. When a phrase ends on the tonic — especially after V or V7 — we hear completion, the musical equivalent of a period at the end of a sentence. The tonic is the reference point for the entire key: all other chords are understood relative to their distance and relationship to it. Its stability is what makes departure from it (toward IV or V) felt as motion and return to it felt as resolution.

Question 4

The subdominant chord (IV) functions as the dominant of the subdominant key, which is why it creates such strong tension demanding resolution back to the tonic.

• T. True
• F. False

Answer: False

This confuses two different things. The strong tension demanding resolution is the dominant's (V's) characteristic function, not the subdominant's. The subdominant (IV) creates motion away from home — lift, color, departure — without the urgent pull back that the dominant generates. It is harmonically ambiguous in direction: after IV, music can move forward to V (completing the I–IV–V–I arc) or return directly to I (plagal cadence). IV does not contain the tendency tones (like the leading tone) that create the V chord's characteristic directional urgency.

Question 5

What is harmonic function, and how does understanding a chord's function differ from knowing its quality (major or minor)?

Model answer: Harmonic function describes the gravitational role a chord plays in tonal music — whether it acts as a point of stability (tonic), departure (subdominant), or tension-demanding-resolution (dominant). Chord quality describes what a chord is — its intervals and sound. A chord's function depends on its position in the key and the acoustic properties it creates, not just its quality. For example, the IV chord in C major is F major (major quality), but its function is subdominant — departure. The V chord G major also has major quality, but its dominant function makes it behave completely differently. Function explains what a chord *does* in the progression; quality only tells you what it sounds like.

The distinction matters because identical quality chords can have opposite functions (I and V are both major in a major key), and because understanding function lets you predict and explain how music moves — why V sounds unresolved, why IV sounds like departure, why I sounds like home — which chord quality alone cannot tell you.