Week 12 — Chapter · Cadences and Phrases

Course: MUS 156 Music Theory I · Kenosis College
Instructor: Professor Hemsworth
Unit: Learning Unit 12 of 16 (Week 12) · two sessions per week
The unit's primary reading · ~30–40 minutes · SLOs 5 and 7 · Read this before the first session if you can, or right after — everything else in the module builds on it.

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Stop one chord early

Here is an experiment you can run on anyone — a bandmate, a roommate, somebody's grandmother. Play or hum a plain progression, the kind every song leans on, and stop one chord before the end. Then watch their face. They will wait. They may actually complain. And if you ask them to sing the chord that's missing, they will sing it — the right one — even if they've never read a note of music in their lives.

That reflex is the subject of this unit. Music moves in phrases — thoughts about the length of a comfortable sung breath — and every phrase lands somewhere. Your ear has been grading those landings your whole life: this one's finished, this one's a pause, this one swerved. Ask yourself how you know when a hymn verse is over, how a karaoke crowd manages to hit the final note together, how a worship team knows the set is floating into one more chorus instead of ending. You know. You've always known. What you don't have yet is the five names trained musicians use for the landings — and the two names they use for the question-and-answer shape that phrases love to make.

By the end of this chapter you will be able to: define a cadence and say why it isn't the same thing as an ending; label the whole landing family — PAC, IAC, half, deceptive, plagal — from a keyed progression; explain the cadential six-four, the famous chord that looks like tonic and behaves like dominant; define a phrase by its cadence rather than its bar count; and diagram a period — antecedent, consequent, question, answer.

Where we are

Unit 9 built triads. Unit 10 stacked sevenths on them and read charts. Unit 11 gave every chord a Roman numeral and a job — tonic, predominant, dominant — and set the functional cycle spinning: T → PD → D → T. This unit asks the cycle one question: where does it stop to breathe? The answer is the cadence, and it turns out the cycle's landings come in a small, learnable set. After this week, one more zoom-out: units 13 and 14 put two independent voices over these landings, and unit 15 cashes everything in on the real-world chart. You are past the halfway mark of the harmony story, and this is the unit where it starts sounding like form.

The cadence: where the phrase lands

A cadence is the harmonic landing that ends a phrase — the last chord or two, the place where the music touches down and the singer breathes. Cadence comes from the Latin cadere, "to fall," and that's honest: it's where the phrase's energy falls to earth.

The most useful analogy in this unit is punctuation. Written sentences end with different marks because thoughts end with different strengths — full stop, comma, question mark, dash. Musical phrases do exactly the same thing, and this week's five cadences are the punctuation marks:

The table below maps each cadence to its punctuation and its formula — the rest of the chapter walks through them one at a time.

Cadence	Punctuation	Formula	The feel
Perfect authentic (PAC)	Full stop.	V (or V7) → I, both root position, do on top	Closed door — finished
Imperfect authentic (IAC)	Soft period	V (or V7) → I, but a condition missed	Arrived, door ajar
Half (HC)	Comma / question mark	phrase stops on V	Leaning — more coming
Deceptive	The plot twist	V (or V7) → vi (VI in minor)	Promised home, got the house next door
Plagal	The "Amen"	IV → I	Home by the gentle side door

One vocabulary correction before anything else, because it decides quiz questions and rehearsal arguments alike: a cadence is not "the ending." Every phrase cadences — that's what makes it a phrase — and most cadences are deliberately not final. A three-minute song lands a couple dozen times and parks once. The family exists because landings come in strengths, and composers spend the weak ones on purpose, saving the strong one for the moment the song is actually done.

The authentic family: PAC and IAC

The strongest landing gesture in tonal music is dominant to tonic — V (or V7) resolving to I. Any phrase that ends that way ends with an authentic cadence. Your ear already files this one under "finished": it's the last two chords of nearly every hymn, anthem, and national song you've ever stood up for, and unit 11 explained the engine — the leading tone pulling up to do, the V7's tritone begging to close, the bass falling sol to do.

But not all authentic cadences are equally final, and the difference is precise enough to earn two names. A perfect authentic cadence (PAC) — the full stop — requires two conditions at the same time:

1. Both chords in root position — the bass sings sol, then do.
2. The melody ends on do — the top voice lands on ^1.

Meet both, and the door closes; you can feel the room relax. Miss either one — the melody ends on mi or sol instead of do, or either chord is inverted — and the result is an imperfect authentic cadence (IAC): a real arrival with the door left slightly ajar. Same two chords, less finality — which makes the IAC a genuinely useful tool when a composer wants "home, but keep walking."

KEY: C major    METER: 4/4    CLEF: treble
| <G3,D4,B4>/h <C4,E4,C5>/h | <G3,D4,B4>/h <C4,E4,E5>/h |

Two cadences in C major, two chords each, on the treble staff. Bar one: a root-position V chord — G3 in the bass with D4 and B4 above — resolving to a root-position I with C5, do, in the melody: ti rises its half step home to do, and both conditions are met — a perfect authentic cadence. (The tonic chord's fifth is omitted so three voices can close cleanly; that's standard practice, and the chord is still C major.) Bar two: the identical V chord, but the tonic arrives with E5 — mi — on top: same harmony, one condition missed, an imperfect authentic cadence.

Misconception check. "The PAC/IAC difference is about the melody note." Half right, and half right fails. The hinge is soprano AND root position — both conditions. Root-position V–I with mi on top: IAC. V in first inversion resolving to I with do on top: still IAC. Run both checks every time — bass first (sol to do?), melody second (ends on do?) — and only a yes-yes earns the word perfect.

The half cadence: stopping on the question

Sometimes a phrase doesn't land at home at all. It walks up to the dominant and stops there — on V, as the phrase's final chord — and the effect is a musical comma: a real pause, zero finality, everything leaning toward the phrase that comes next. That's the half cadence (HC).

KEY: G major    METER: 4/4    CLEF: treble
| <G3,B3,D4>/h <A3,C4,E4>/h | <D4,F#4,A4>/w |

A short phrase in G major — one sharp, F♯ — on the treble staff: the tonic chord (G–B–D), then ii (A–C–E, the predominant doing its job), then a whole-note V chord (D–F♯–A), and the phrase ends right there. No resolution inside this breath. That deliberate full stop on the dominant is a half cadence.

The distinction that keeps students honest: the half cadence ends on V; the authentic cadence ends with V going to I. If the V resolves inside the same breath, you're looking at an authentic cadence. If the phrase closes and the V is still hanging in the air — comma. The next phrase starts fresh and answers it. You know this sound intimately: it's the "yeah, and…?" moment in every verse that sets up a chorus.

The deceptive cadence: the promise delayed

Now the one that gets the gasp. The phrase builds to V7 — the ear hears the promise, pre-tastes the tonic — and the music lands on vi instead. In C major: G7, and then, instead of C… A minor.

KEY: C major    METER: 4/4    CLEF: treble
| <G3,B3,D4,F4>/h <A3,C4,E4>/h |

One bar in C major: a fully loaded V7 (G–B–D–F) resolving not to the tonic but to vi — A minor (A–C–E). The bass, promised its fall from sol to do, steps up to la instead. Everything above it resolves almost normally — which is why the swerve sounds magical rather than broken.

This is the deceptive cadence (V–vi in major; V–VI in minor), and the name is slightly unfair to it, because nothing is being cheated. Look at what vi shares with I in C major: A minor is A–C–E, C major is C–E–G — two common tones. The ear is promised tonic and receives a tonic-family chord (unit 11 filed vi under tonic function) — same neighborhood, wrong driveway. It's not a wrong chord; it's a delayed promise. The real PAC almost always arrives one phrase later, and it lands twice as hard for having been withheld.

In minor keys, spell the swerve carefully: in A minor the dominant is E major — E, G♯, B — because harmonic minor raises the leading tone (unit 11's headline), and it lands on VI: F major — F, A, C. Capital VI, because it's a major chord; the bass makes the same step up from sol to the sixth degree.

Where you already live with this: the worship set that "should have ended" and instead lifts into one more chorus while the room's hair stands up. The V7 went to vi. Now you'll hear it coming — and, on your own gigs, order it on purpose when the moment needs one more loop.

Misconception check. "Deceptive = somebody played the wrong chord." Play a genuinely wrong chord after V7 sometime — try D♭ major — and compare. The deceptive resolution is old, deliberate craft: a tonic-family substitute that keeps two of the tonic's own notes. If it were a mistake, it wouldn't have a 300-year-old name.

The plagal cadence: the Amen

One landing skips the dominant entirely: IV → I, the plagal cadence. It's the "A-men" at the end of hymn singing — so literally that musicians call it the Amen cadence.

KEY: C major    METER: 4/4    CLEF: bass
| <F2,A2,C3>/h <C3,E3,G3>/h |

Two warm chords low on the bass staff: IV in C major (F–A–C) settling directly onto the tonic (C–E–G). No leading tone, no tritone, none of the dominant's urgency — a predominant-family chord stepping straight home.

Because it has no leading tone, the plagal cadence closes gently rather than decisively — which is why, in practice, it usually arrives after the real ending: the song lands with an authentic cadence, and then IV–I follows as a tag, a hand smoothing the blanket. Gospel endings stack these; so does practically every rock ballad that ends on a slow IV–I sway. When your band "tags the ending," this is the tag's grammar.

The cadential six-four: looks like tonic, behaves like dominant

One decoration is so common at cadences that it needs its own honest introduction — and "honest" is the right word, because this chord's spelling and its behavior disagree, and this course tells you the truth about both.

Here's the move, in F major: the phrase drives toward its cadence, and on the strong beat the band plays… the tonic's notes — F, A, C — but with C in the bass. Then the actual V chord (C–E–G) over that same bass note. Then, finally, I.

KEY: F major    METER: 4/4    CLEF: treble
| <C4,F4,A4>/h <C4,E4,G4>/h | <F3,A3,C4>/w |

Three chords in F major on the treble staff: the tonic triad's notes stacked over a C bass — that's the cadential six-four, written I6/4 — then the true dominant (C–E–G) on the same bass note, then the arrival on root-position I (F–A–C). Listen to the bass line: sol… sol… do. The six-four and the V share the dominant's bass note; the six-four is tonic-shaped paint on a dominant-shaped wall.

Read the label the unit-10 way: I6/4 means "the tonic triad, second inversion — fifth in the bass" — and the figures keep their slashes (6/4), because a hyphen means a suspension, which is unit 14's business. In minor, the same decoration is i6/4 (in A minor: A–C–E over an E bass, then E major, then A minor).

Now the honesty: it looks like tonic, and it behaves like dominant. The chord contains the tonic triad's notes, but it is not a tonic arrival — the bass sits on sol, the whole gesture leans into the V it decorates, and the ear files those two beats as one big dominant moment. The six-four delays the V by two beats and doubles the arrival's payoff; you've heard it as the "hold… hold…" chord before the final cadence of every big anthem and gospel ending in your life. Analytically, the entire gesture — six-four, V, and all — lives in the dominant area; the real tonic is the I that follows.

Misconception check. "It spells like I, so it counts as tonic." Function lives in the bass and the behavior, not in the spelling. Bass on sol, glued to the V behind it: dominant area. This is also this week's classic chatbot error — ask one to analyze C/G → G7 → C and there's a fair chance it calls the first chord "tonic function." Now you know better than the tool does. Catching it is graded work this week.

The phrase: where the music breathes

Time to zoom out from the landing to the thought that lands. A phrase is a complete musical thought ending in a cadence — in most of the music this course touches, about the length of one comfortable sung breath, often four bars.

But hold the definition by the right end: a phrase is defined by its cadence, not by its bar count. Four bars that never land are a fragment, a run-on. Three or five or six bars that carry one thought to a real landing are a phrase, whatever the ruler says. When you're hunting phrases in a real song, don't count bars — find the breaths. Where does the melody exhale? Where would a singer sneak air? Land on the landings first; the bar counts will sort themselves out.

Misconception check. "A phrase is any four bars." Four bars is the common size, not the definition — like "a sentence is about ten words." The cadence is the period at the end of the sentence; no cadence, no phrase. Trust the breath, not the ruler.

Antecedent, consequent, period: the question and the answer

Phrases love to travel in pairs, and the pairing has a shape your ear already knows by heart: the first phrase asks, the second answers.

• The antecedent — the question — closes on a weaker cadence, usually a half cadence (sometimes an IAC). It raises the eyebrow.
• The consequent — the answer — typically opens just like the antecedent did, then closes the deal with a PAC.
• Together the pair makes a period: question, answer, one complete musical paragraph.

The textbook example is one you can sing right now — the Ode to Joy theme, from Beethoven's Ninth (1824):

KEY: C major    METER: 4/4    CLEF: treble
| E4/q E4/q F4/q G4/q | G4/q F4/q E4/q D4/q | C4/q C4/q D4/q E4/q | E4/q. D4/e D4/h |
| E4/q E4/q F4/q G4/q | G4/q F4/q E4/q D4/q | C4/q C4/q D4/q E4/q | D4/q. C4/e C4/h |

Eight bars in C major, almost all even quarter notes. Bars 1–4 — the antecedent — walk stepwise and end hanging on a held D4: re, the note the dominant chord holds up. (Sing it: the fourth bar goes "mi… re, re—" and stops. Pure question mark — a half-cadence close.) Bars 5–8 — the consequent — begin identically, then bend the ending down one step further to land on a held C4: do, over the tonic: the PAC answer. Two phrases, same opening, weak close then strong close: a period.

Sing it once and raise a hand wherever you'd breathe. Your hands will go up at bar 4 and bar 8. The form was in your lungs before it was ever on a page — which is this course's whole thesis, one more time.

Misconception check. "Period is just the old-music word for phrase." No — a period is two phrases in a specific relationship: antecedent (weak close) plus consequent (PAC). One thought is a phrase; a question-and-answer pair is a period. Keep the pair straight and you can ignore the deeper taxonomy — sentences, expansions, and the rest of the phrase zoo belong to later courses.

Why this makes you a better musician

Everything in this unit converts to bandstand currency the same week you learn it. Endings, first: "big finish" is not a vibe, it's a recipe — root-position V, root-position I, melody on do — and now you can call it: tell the bass player "sol, then do," tell the singer "end on the tonic note," and the whole band lands together on the first try instead of the fourth. The deceptive save, second: when the leader stretches the set and the V7 lifts into vi for one more chorus, you'll hear it coming a beat early and follow it — instead of slamming the tonic into somebody else's plot twist. Memory, third: musicians who learn songs fast don't memorize thirty-two bars; they memorize four questions and four answers. Hear a verse as antecedent–consequent and you've cut the memory load in half and gained a map — you know where the song breathes, so you know where to cue the singer, where the fill belongs, where the arrangement can open up. And when the gospel ending goes "hold… hold… now" — that hold is a cadential six-four, you know its bass note is sol, and you know exactly which two chords come next. In the studio you'll do all of this live: predict landings before they arrive, then build endings your own group has to land, blind, for the room.

Key terms

• Cadence — the harmonic landing that ends a phrase; the last chord or two, where the music touches down.
• Authentic cadence — a cadence ending V (or V7) → I; the dominant-to-tonic landing.
• Perfect authentic cadence (PAC) — an authentic cadence with both chords in root position and the melody ending on do. The full stop.
• Imperfect authentic cadence (IAC) — an authentic cadence missing at least one PAC condition (melody not on do, or a chord inverted). Arrival with the door ajar.
• Half cadence (HC) — a phrase ending on V, unresolved. The comma.
• Deceptive cadence — V (or V7) resolving to vi (VI in minor) instead of I. The delayed promise.
• Plagal cadence — IV → I; the "Amen," usually a tag after the real close.
• Cadential six-four — the tonic triad's notes over sol in the bass (written I6/4; i6/4 in minor), decorating and delaying the V it resolves into. Looks like tonic, behaves like dominant.
• Phrase — a complete musical thought ending in a cadence; defined by the cadence, not the bar count.
• Antecedent — the question phrase of a pair; closes on a weaker cadence, usually a half cadence.
• Consequent — the answer phrase; usually opens like the antecedent and closes with a PAC.
• Period — an antecedent–consequent pair: two phrases, question then answer, one complete paragraph.

Summary

• A cadence is where a phrase lands — punctuation, not necessarily an ending. Most cadences are deliberately non-final.
• Authentic = V(7) → I. PAC needs both chords root position and do on top — two locks, both must turn; anything less is an IAC.
• Half cadence: the phrase stops on V — a comma. Deceptive: V(7) → vi (V → VI in minor; in A minor, E–G♯–B to F–A–C) — a delayed promise to a tonic-family stand-in. Plagal: IV → I, the Amen tag.
• The cadential six-four (I6/4, i6/4 in minor) puts the tonic's notes over sol in the bass and leans into V: looks like tonic, behaves like dominant. Slashes for figures, always — hyphens mean suspensions (unit 14).
• A phrase is a complete thought ending in a cadence — find the breaths, not the bar counts. A period is two phrases: antecedent asks (HC), consequent answers (PAC). Ode to Joy is the one you can always sing to remember it.

Check your understanding

Work these before peeking — they're ungraded, and worked answers follow at the bottom of the page.

1. In G major, a phrase ends with a root-position D chord moving to a root-position G chord, and the melody ends on B. Name the cadence — and name the single change that would make it a PAC.
2. Your band vamps I–ii–V in C and stops dead on the V for two full beats while the singer breathes; the next phrase starts back on I. What cadence just happened, and why isn't it an authentic cadence "waiting to finish"?
3. Spell the two chords of a deceptive cadence in A minor, and explain where the G♯ comes from.
4. A chart in D major ends: D/A → A7 → D. A friend says the D/A is "the tonic arriving early." What's right and what's wrong in that sentence, and what is the bass note doing?
5. You hear an eight-bar tune: bars 1–4 end hanging on re over a V chord; bars 5–8 start the same as bars 1–4 and end on do over I with everything root position. Name the cadence at bar 4, the cadence at bar 8, and the name of the whole eight-bar shape.

Answers (worked reasoning — read after attempting)

1. It's an IAC: the chords are root position (bass D to G — sol to do), but the melody ends on B — mi in G major, so the second PAC condition fails. The single change: end the melody on G (do). (Both conditions, always: root position and do on top.)
2. A half cadence — the phrase ended on V, deliberately, and the singer's breath marks the phrase boundary. It isn't an authentic-cadence-in-waiting because the resolution never happens inside the phrase: the next phrase starts fresh from I. HC ends on V; authentic ends with V going to I in the same breath.
3. V = E major: E–G♯–B. VI = F major: F–A–C. The G♯ is harmonic minor's raised seventh (unit 11's rule): the dominant in a minor key borrows the leading tone so it can actually pull — a minor v (E–G–B) wouldn't make the promise that the deceptive resolution then delays. Capital VI because F–A–C is a major chord.
4. Right: the chord D/A does contain the tonic triad's notes (D–F♯–A). Wrong: it isn't the tonic arriving — it's the cadential six-four (I6/4). The bass note is A — sol — and it stays put while A7 (the real V7) sounds, then falls to D. Looks like tonic, behaves like dominant; the true arrival is the final D.
5. Bar 4: a half cadence (hanging on re over V — the question). Bar 8: a PAC (do on top, root position — the answer). The whole shape: a period — antecedent plus consequent. (You've just analyzed Ode to Joy from memory.)

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Next in this module: the Readings & Resources page if you want other angles on cadences and phrases, then Tutorial 12 — your AI tutor session, due before Week 12's second session so the studio's prediction rounds can build on it.

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