Unit 29 · Upper Intermediate

Secondary Dominants and Tonicization

Create directed harmonic momentum.

Lesson
Borrow dominant pull for a moment
Estimated time
145 minutes
Status
Previewing
Preview available

Complete the required prior unit before this unit can be marked complete. You may still read and try every activity.

What you will learn

Identify and use secondary dominants, resolve them to temporary targets, and write a progression that tonicizes a diatonic chord without fully modulating.

Why this matters: Secondary dominants add direction inside a key. They let one chord briefly feel like a destination, creating lift without abandoning the original tonal center.

Before you begin

Major-key harmony · Dominant seventh quality · Guide-tone resolution · Roman numerals · Lead-sheet reading

A secondary dominant points at a chord inside the key

In C major, Dm is ii. Its dominant is A7, so A7 can be labeled V7/ii when it resolves to Dm. The slash means dominant of the target chord.

Secondary dominants usually contain accidentals outside the key. Those altered notes need a clear resolution; otherwise the chord sounds random instead of directed.

Progression · Key C · 4/4

Common tonicizations in C

To iiA7-DmV7/ii-ii · 5-of-2m to 2m
To VD7-GV7/V-V · 5-of-5 to 5
To viE7-AmV7/vi-vi · 5-of-6m to 6m
HomeG7-CV7-I · 5-7 to 1

Each first chord is dominant in quality even though it is not diatonic to C major. Its job is to intensify the following target.

Lead sheet · Key C · 4/4 · 76 BPM

Lantern Turns: A progression with temporary spotlights

Capo: None

A × 2

ChomeE7V7 of viAmtemporary targetA7V7 of ii

B × 1

Dmtarget becomes predominantD7V7 of VG7real dominantChome restored

E7 spotlights Am, A7 spotlights Dm, and D7 spotlights G. C still remains the governing key because the phrase returns through G7 to C.

1 · Model

Observe: tonicization with secondary dominants

Observe stage for tonicization with secondary dominants, with instructions and success criteria stated in text.

  1. Observe V7/vi, V7/ii, and V7/V in C.
  2. Hear the altered third of each dominant resolving to the target.
  3. Compare tonicization with full modulation.

Help you can use: Complete written model · Audible comparison target

  • Each secondary dominant has dominant quality.
  • The target chord follows clearly.
  • The original key remains recoverable.
2 · Guided attempt

Try with prompts: tonicization with secondary dominants

Try with prompts stage for tonicization with secondary dominants, with instructions and success criteria stated in text.

  1. Choose a diatonic target chord.
  2. Build its dominant seventh.
  3. Resolve it and name the accidental.

Help you can use: Numbered decisions · One-variable revision

  • Each secondary dominant has dominant quality.
  • The target chord follows clearly.
  • The original key remains recoverable.
3 · Fade support

Use fewer prompts: tonicization with secondary dominants

Use fewer prompts stage for tonicization with secondary dominants, with instructions and success criteria stated in text.

  1. Use slash notation without chord-name prompts.
  2. Write two secondary dominants in one phrase.
  3. Check whether the original key still returns.

Help you can use: Check the model only after the attempt

  • Each secondary dominant has dominant quality.
  • The target chord follows clearly.
  • The original key remains recoverable.
4 · Independent attempt

Perform independently: tonicization with secondary dominants

Perform independently stage for tonicization with secondary dominants, with instructions and success criteria stated in text.

  1. Analyze secondary dominants in a progression.
  2. Write and perform a progression with three tonicizations.
  3. Explain each target and resolution.

Help: Complete without prompts or a model.

  • Each secondary dominant has dominant quality.
  • The target chord follows clearly.
  • The original key remains recoverable.

Reflect

Track each temporary target

List each secondary dominant, its target chord, its altered note, and how the phrase returns to the home key.

Guided practice

Build the skill in manageable steps

Exercise 1

Target first

Prevent random chromatic dominant chords.

  1. Pick ii, iii, IV, V, or vi as target.
  2. Build the target's V7.
  3. Resolve the altered tone by step.
  4. Return to the original key.
Success sounds or feels like
  • The target is named before the dominant.
  • The altered note resolves by step.
  • The home key is restored.
Make it smaller when
  • Use V7/V.
Increase difficulty when
  • Use two secondary dominants in sequence.
Exercise 2

Three temporary spotlights

Use tonicization as songwriting motion.

  1. Write an eight-bar progression in one key.
  2. Add two or three secondary dominants.
  3. Label every slash chord.
  4. Perform and listen for directed pull.
Success sounds or feels like
  • All slash labels are accurate.
  • Each dominant resolves to its target.
  • The phrase still has a home key.
Make it smaller when
  • Use the model progression.
Increase difficulty when
  • Transpose to D or G.

Common mistakes

Match the problem to a better next try

Chromatic dominant chords appear without clear resolution.

Likely cause: The target chord was not chosen first.

Try: Name the target, then build its V7.

The phrase never returns to the original key.

Likely cause: Tonicization became an unplanned modulation.

Try: Add a cadence or common-tone route back home.

The secondary chord lacks dominant quality.

Likely cause: A diatonic minor chord was substituted for V7.

Try: Build 1-3-5-b7 from the target's fifth.

Knowledge check

Explain the practice decision

1. In C major, what is V7/V?
2. What does the slash in V7/ii mean?
3. What keeps tonicization from becoming full modulation?

Check your work

Borrow dominant pull for a moment assessment

Complete every required criterion and record the requested reflection or value.

You check off guitar-playing tasks yourself. FretGarden only grades tasks where you tap, click, or choose an answer on screen.

Review plan

Return before the idea fades

Now

Build V7/V and V7/vi in C.

Next session

Write one phrase with two resolved secondary dominants.

One week

Analyze tonicization in a new chart.

Long term

Use target-first thinking whenever chromatic dominants appear.

Optional extension: Chain V7/vi to V7/ii to V7/V, then decide whether the result still feels like one key.