Leave quickly and it was tonicization; settle and cadence and you have modulated. The tool below drills the borrowing.
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Unit 7 borrowed dominants, from your own notes
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The borrowing recipe: one accidental, one lean
A secondary dominant is built on the fifth of its target and raised until it is a major triad or dominant seventh: the added accidental manufactures a leading tone to the target's root, and the ear hears a momentary key. V of V, two of the scale sharpened, is the workhorse; V of vi, V of IV and the rest follow the same recipe. Spot them by the accidental, then name the target.
Resolution obeys the borrowed key's rules
A secondary dominant resolves like a real one: its temporary leading tone rises to the target's root, its seventh falls by step, and the target chord arrives as expected, V of V to V, V of vi to vi. The deceptive option exists here too. Voice leading errors in secondaries are the same errors as in primaries, unresolved leading tones above all, so apply the Unit 4 checklist inside the borrowed frame.
Secondary leading tone chords sharpen the pull
The same tonicization can ride a diminished chord: vii diminished of V, fully or half diminished as sevenths, packs the leading tone pull without the dominant root. Spelling drills build it a half step below the target's root. Targets are limited to chords that could be tonics, major or minor triads, which is why the diminished vii itself can never be tonicized: nothing can rest there.
Tonicization against modulation: visiting against moving
The distinction is duration and cadence. A tonicization leans on its target for a beat or two and returns; a modulation establishes the new key with its own cadence, usually via a pivot chord that belongs to both keys, reinterpreted mid phrase. Closely related keys, one accidental away, are the common destinations. The exam asks which happened; answer with the cadence evidence.
Hearing and spelling secondaries under time pressure
In analysis, hunt accidentals: each one outside the key signature is either a nonchord tone, minor's raised seventh, or a secondary function, and the chord's build settles which. In part writing, spell the target first, place its borrowed dominant a fifth above with the manufactured leading tone, and resolve by the borrowed rules. The two step habit, target then borrower, keeps the arithmetic honest when the clock runs.
What to photograph for Harmony and Voice Leading IV
Your secondary spelling drills and pivot charts. Related: Unit 6, photo to quiz and pricing.
Sources used on this page
- College Board, AP Music Theory
- Secondary dominant
- Tonicization
- Modulation (music)
- Secondary leading-tone chord
- Active recall
- Spaced repetition
- Testing effect
- Forgetting curve
- Generation effect
- Judgment of learning
- Metacognition
- Desirable difficulty
- Distributed practice
- Formative assessment
- Flashcard
- Cloze test
- Multiple choice
- Test (assessment)
- Educational assessment
- Advanced Placement
- Curriculum
- Study skills
- Study guide
- Note-taking
- Overlearning
- Instructional scaffolding
- Item analysis
- Mastery learning
| Device | The recipe | The check |
|---|---|---|
| V of V | Major triad on two, sharpened | Resolves to V |
| V7 of x | Dominant seventh on target's fifth | Leading tone up, seventh down |
| vii dim of x | Half step below target's root | Same pull, no root |
| Valid targets | Major or minor triads only | Nothing tonicizes vii |
| Tonicization | A lean, then return | No new cadence |
| Modulation | Pivot, then cadence | New key confirmed |
What does AP Music Theory Unit 7 cover?
Secondary function: secondary dominants and leading tone chords, their spelling and resolution, and the tonicization against modulation boundary.
How do I spot a secondary dominant fast?
Hunt the accidental: an out of key sharp usually manufactures a leading tone; build the chord and name the target a fifth below.
Why can some chords not be tonicized?
Only chords that could be tonics qualify: major and minor triads. The diminished vii offers no resting place, so nothing leans on it.
What separates tonicization from modulation?
Cadence and residence: a lean returns without cadencing; a modulation pivots into the new key and confirms it with a cadence.
How do secondary chords resolve?
By the borrowed key's rules: temporary leading tone up to the target's root, any seventh down by step, target arriving as its local tonic.
Can I build questions from my own Unit 7 notes?
Yes. Whatever you upload sets the boundary. Photograph the pages or send the chapter as a PDF and the questions stay inside it.
Last updated: 2026-08-15