Questions: Harmonic Progression Patterns in Tonal Music

Question 1

A student analyzing a blues song says 'the I7 chord is wrong — a dominant seventh must resolve to the chord a fourth above.' How should a music theorist respond?

• A. The student is correct — I7 in any context must resolve upward by a fourth
• B. In blues, I7 functions as a stylistic color rather than a functional dominant — genre convention overrides common-practice resolution expectations
• C. The student is wrong because dominant seventh chords never need to resolve
• D. Blues uses a different note than standard I7, which is why it sounds stable

Answer: (B)

The same chord type can carry completely different meaning in different contexts. In common-practice tonal music, a dominant seventh chord (built on the fifth scale degree) demands resolution. But in blues, the I7 chord is built on the first scale degree and never resolves — the dissonance becomes a persistent stylistic color. The student's error is applying one genre's conventions to another. As the explainer states: 'context and genre convention determine what a progression means.' Options A and C both assume chord function is universal; option D is factually wrong.

Question 2

What distinguishes the I–V–vi–IV pop progression from the ii–V–I jazz/classical progression in terms of harmonic motion?

• A. The pop progression resolves more definitively to the tonic; the ii–V–I is perpetually unresolved
• B. The pop progression cycles through all functional zones without delivering a full authentic cadence; ii–V–I drives to a definitive tonic resolution
• C. The pop progression uses minor chords, which always sound unresolved; ii–V–I uses only major chords
• D. There is no real functional difference — both progressions serve identical harmonic purposes

Answer: (B)

The I–V–vi–IV pattern never fully arrives — it loops through tonic, dominant, tonic substitute (vi), and subdominant without the strong subdominant→dominant→tonic arc that produces a conclusive authentic cadence. This creates pleasurable, open-ended motion suited to pop's aesthetic of yearning. The ii–V–I, by contrast, is the most functional progression in tonal music: each chord anticipates the next, and I is the destination, not a waystation. Option A reverses the description. Options C and D are simply false.

Question 3

In tonal harmony, a deceptive cadence occurs when V resolves to vi instead of I. This substitution works because vi and I share no common tones.

• T. True
• F. False

Answer: False

The deceptive cadence works precisely BECAUSE vi and I share common tones, not because they don't. In C major, I = C-E-G and vi = A-C-E — two of the three notes are identical. This makes vi a convincing substitute for I: the voice leading from V is similar (ti still resolves to do, and many other voices move as expected), but the bass moves to the sixth scale degree instead of the tonic. The surprise is that two shared tones make vi sound almost-but-not-quite like resolution.

Question 4

Harmonic progression patterns like ii–V–I retain their functional identity when transposed to a different key.

• T. True
• F. False

Answer: True

Harmonic function is relational, not tied to specific pitches. ii–V–I in C major (Dm–G–C) and ii–V–I in F major (Gm–C–F) have the same functional momentum — subdominant pushing to dominant, dominant resolving to tonic — because the relationships between scale degrees are preserved by transposition. This is what makes harmonic analysis powerful: the pattern is abstract and key-independent. A musician who has internalized ii–V–I recognizes it in any key.

Question 5

Why does a deceptive cadence (V–vi) feel surprising, and what does this tell us about how harmonic progressions work?

Model answer: A deceptive cadence feels surprising because the listener has internalized the expectation that V resolves to I — the authentic cadence is the default. When V moves to vi instead, the expected resolution is withheld and a different chord appears in its place. This tells us that harmonic progressions work through expectation: patterns like V→I become so deeply internalized that deviations are heard as intentional choices against a background expectation. The surprise has force because the convention is real. If the listener had no expectation of V→I, the deceptive cadence would simply be another chord change.

The ability to hear a deceptive cadence as surprising requires having already internalized authentic cadence patterns. This is the core insight: harmonic progressions are conventions, and breaking them is heard as meaningful because the conventions are real enough that departures register as choices. A composer can only 'deceive' a listener who expected something different.