Questions: Harmonic Function and Chord Progressions

Question 1

A composer writes the progression V → IV in the middle of a piece in C major. A student says this is fine because both chords are diatonic. What harmonic problem is the student missing?

• A. IV is not a diatonic chord in C major
• B. V and IV cannot appear in the same phrase under any circumstances
• C. V → IV moves backward in harmonic function — from dominant to subdominant — undermining the sense of forward motion toward resolution
• D. The progression skips the tonic, which is required between any two non-tonic chords

Answer: (C)

Harmonic function describes each chord's role relative to the tonic. Dominant (V) creates high tension demanding resolution to tonic; subdominant (IV) creates forward momentum toward the dominant. V → IV reverses this logic, retreating from high-tension dominant back to subdominant. Both chords are diatonic, but functional logic requires motion from subdominant toward dominant, not backward. The progression fights against the directional grain of tonal music.

Question 2

Which of the following progressions most clearly exemplifies the T → SD → D → T functional arc?

• A. I → V → IV → I
• B. I → IV → V → I
• C. IV → I → V → IV
• D. I → V → I → IV

Answer: (B)

I → IV → V → I traces the canonical tonic → subdominant → dominant → tonic arc. The I chord establishes stability; IV creates tension and forward motion; V intensifies the pull toward resolution; I fulfills it. Option A (I → V → IV → I) breaks the functional ordering by placing dominant before subdominant, then ending with a plagal IV → I motion that lacks the drive of an authentic V → I cadence.

Question 3

A dominant seventh chord (V7) that resolves to vi instead of I no longer expresses dominant function — the unexpected move reassigns it a different harmonic role.

• T. True
• F. False

Answer: False

V7 → vi is a deceptive cadence, but V7 still expresses dominant function. The dominant chord creates tension and expectation; the deceptive resolution to vi sidesteps that expectation rather than canceling the underlying function. The vi chord substitutes for I (they share two common tones) and temporarily defuses the tension, but it is precisely V7's dominant function that makes the deception effective — the listener expects I and gets vi. Function is a property of the chord's position and behavior, not only its resolution target.

Question 4

A I chord generally provides a complete sense of rest and stability whenever it appears in a progression.

• T. True
• F. False

Answer: False

Context and voice leading dramatically affect how stable a I chord feels. A I chord in first inversion (third in the bass) feels less stable than root-position I. A I chord arriving mid-phrase may feel like a momentary landing rather than a final cadence. The Common Misconceptions note directly states that 'not all I chords feel equally tonic.' Tonic function is contextual, not automatic — the same chord can feel conclusive or provisional depending on what surrounds it.

Question 5

Explain why V → IV feels harmonically awkward in tonal music. Use the concept of harmonic function in your answer.

Model answer: V has dominant function: it creates high tension and a strong pull toward resolution on the tonic. IV has subdominant function: it provides forward momentum in the direction of the dominant. Moving V → IV reverses the functional order — retreating from dominant 'back' to subdominant rather than resolving forward to tonic. Tonal progressions derive their sense of direction from the T → SD → D → T arc; V → IV undermines this by releasing tension in the wrong direction and retracing harmonic ground.

The functional hierarchy (T → SD → D → T) is what gives tonal progressions their sense of inevitability. Any motion that moves backward in that hierarchy fights the grain of tonal logic and sounds like a step in the wrong direction. This is independent of whether both chords belong to the key — diatonicism and harmonic function are separate questions. A student who knows Roman numerals but not functional logic will accept V → IV as 'two diatonic chords'; a student who grasps function recognizes it as backward motion.