Music Theory for Producers

Secondary Dominants

Q: What is a secondary dominant?

A secondary dominant is a dominant seventh chord (or major chord) built on the fifth scale degree of a chord other than the tonic. Written as V/x (pronounced "five of x"), it temporarily tonicizes that chord, creating a strong pull toward it. For example, in C major, V/V is D7 (the dominant of G), creating a stronger resolution to G than a plain diatonic D minor would.

Q: What is the most common secondary dominant?

The most common secondary dominant is V/V (five of five). In C major, that is D7. It appears in countless pop, jazz, gospel, and soul songs because it creates a strong two-chord motion to the V (G major), then home to I (C major). The sequence ii - V/V - V - I (Dm - D7 - G - C in C major) is one of the most recognizable chord movements in Western music.

Q: How are secondary dominants different from borrowed chords?

Secondary dominants are non-diatonic chords that temporarily tonicize another chord by acting as its dominant (V7). They create a forward pull toward a specific target chord. Borrowed chords come from a parallel mode (like taking iv from parallel minor) and add modal color without targeting a specific destination. Secondary dominants are functional (they want to resolve), while borrowed chords are more coloristic.

The non-diatonic chords that create the strongest possible pull toward any chord in a key.

Secondary dominants are the secret behind gospel progressions, jazz chains, and blues pivots. Once you hear them, you will find them everywhere.

What Is a Secondary Dominant?

The Basic Idea

Every chord in a key can become a temporary tonic. A secondary dominant is the dominant seventh chord (V7) of that temporary tonic, borrowed for one moment to create a stronger pull toward it.

In C major, the V chord is G. The V7 of G is D7. Play D7 before G and G suddenly feels much more like an arrival. That D7 is the secondary dominant V/V.

Why They Work

A dominant seventh chord contains a tritone (the interval between the 3rd and 7th scale degrees). This tritone wants to resolve outward. When you build a dominant seventh on any pitch, your ear expects resolution a fifth down.

Secondary dominants exploit this instinct. They temporarily borrow the strongest resolution force in music and aim it at whatever chord you choose.

The Notation

Written as V/x, pronounced "five of x." V/V means "the five chord of the five chord." V/ii means "the five chord of the two chord." The slash always points to the target chord.

In C major: V/V = D7 (resolves to G), V/ii = A7 (resolves to Dm), V/IV = C7 (resolves to F), V/vi = E7 (resolves to Am).

Secondary Dominants vs Borrowed Chords

Secondary dominants are functional: they create forward motion toward a specific target chord. They are dominant sevenths with a job to do.

Borrowed chords (modal interchange) are coloristic: they add flavor from a parallel mode without targeting a specific destination. They decorate rather than propel.

The 5 Secondary Dominants in a Major Key

You can build a secondary dominant on any diatonic chord except the vii (diminished). Here are all 5, shown in C major.

Symbol	Name	In C Major	Resolves To	Diatonic Version	Feel	Best For
V/V	Five of Five	D7	G (V)	Dm	Bright, uplifting, gospel-tinged forward motion	Pop, gospel, country, soul, jazz
V/ii	Five of Two	A7	Dm (ii)	Am	Jazzy, sophisticated, melancholy pull	Jazz, bossa nova, neo-soul, R&B
V/IV	Five of Four	C7	F (IV)	C (plain major)	Blues-like, funky, Mixolydian flavor	Blues, funk, rock, soul, hip-hop
V/vi	Five of Six	E7	Am (vi)	Em	Dramatic, movie-score tension, emotional shift	Film scores, pop ballads, R&B, classical
V/iii	Five of Three	B7	Em (iii)	Bm (or Bdim)	Bright surprise, modal twist, unexpected color	Jazz, classical, sophisticated pop

How to Build Any Secondary Dominant

The Formula

To find the secondary dominant of any chord: go a perfect fifth above that chord's root, then build a dominant seventh chord (major triad + minor 7th) on that note.

Example: V/vi in C major. The vi chord is Am (root = A). A fifth above A is E. Build a dominant seventh on E: E7 (E, G#, B, D). That G# is not in C major, but that is what makes it a secondary dominant.

Target Chord	Secondary Dominant	How to Build It	Note
ii (Dm in C)	A7 = V/ii	Major chord a fifth above ii, add b7	Raises the 7th of ii temporarily
iii (Em in C)	B7 = V/iii	Major chord a fifth above iii, add b7	Rare but used in jazz and baroque
IV (F in C)	C7 = V/IV (I7)	The tonic chord plus a minor 7th	Blues staple; gives the IV a stronger pull
V (G in C)	D7 = V/V	Major chord a fifth above V, add b7	Most common; found in all popular genres
vi (Am in C)	E7 = V/vi	Major chord a fifth above vi, add b7	Dramatic; makes vi feel like a temporary home

5 Classic Progressions Using Secondary Dominants

These progressions appear in thousands of songs across genres. Secondary dominants are the ingredient that makes them feel strong and inevitable.

The Gospel Turnaround

Gospel, soul, R&B, jazz, barbershop

I - V/ii - ii - V/V - V - I

In C: C - A7 - Dm - D7 - G - C

The backbone of gospel, soul, and hymn writing. Chains secondary dominants through the circle of fifths back to home. Every chord pulls strongly toward the next.

The Blues Pivot

Blues, funk, soul, rock, hip-hop

I - I7 - IV - I

In C: C - C7 - F - C

Using I7 (which is V/IV) creates a blues feel before moving to the IV chord. James Brown, B.B. King, and virtually every blues artist uses this. The I7 makes the IV chord feel earned.

The Cycle of Fifths Walk

Jazz, classical, sophisticated pop, musical theatre

I - V/vi - vi - V/V - V - I

In C: C - E7 - Am - D7 - G - C

Moves through a chain of secondary dominants walking around the circle of fifths. Common in baroque music, jazz standards, and sophisticated pop arrangements.

The Neo-Soul Deceptive

Neo-soul, R&B, indie pop, lo-fi

I - V/ii - ii - I

In C: C - A7 - Dm - C

Uses V/ii to target the ii chord, then the ii falls back to I instead of resolving to V. Common in neo-soul for its jazzy-but-accessible feel. The A7 adds spice without going too far from home.

The Classic ii-V/V-V-I

Pop, country, jazz, gospel, folk

ii - V/V - V - I

In C: Dm - D7 - G - C

The single most common secondary dominant application. The D7 (V/V) creates a double dose of tension before the V resolves to I. Found in hymns, pop choruses, country songs, and jazz turnarounds.

Secondary Dominants in Hip-Hop and Modern Production

Sample Flipping

Many classic soul and jazz samples used heavy secondary dominants. When you detect the chord progression of a sample at chords.beatkey.app, the "wrong" chords (non-diatonic major or dominant seventh chords) are almost always secondary dominants.

Knowing they are secondary dominants (not random notes) lets you pitch the sample correctly and write basslines that honor the original harmonic motion.

The I7 Blues Pivot

The most-used secondary dominant in hip-hop is V/IV: the I7 chord. C7 in C major. It is literally just adding a flat 7 to the tonic chord, and it immediately signals "blues" to any listener.

If you want that dusty, old-school, funk-flavored sound, start on I7 before going to IV. J Dilla, Pete Rock, and Madlib all leaned on this pivot constantly.

Loop-Based Production

Secondary dominants create natural loop points because they create strong expectations. A 2-bar loop of I - V/ii - ii - V feels like it is constantly pulling forward, even when it repeats. That tension-release within the loop is what makes it groove.

Compare to a plain I - ii - V loop: it is fine, but less urgent. Adding V/ii makes the ii feel like a destination.

Chord Detection Workflow

When you see a non-diatonic chord in a chord detection result:

Identify the key (use BeatKey at beatkey.app)
List the 7 diatonic chords of that key
Find the chord that does not fit
Check: is it a major or dominant 7th?
Check: does the next chord's root sit a fifth below?
If yes, it is a secondary dominant

Chaining Secondary Dominants

You can link secondary dominants in a chain, walking around the circle of fifths. This technique powers gospel music, jazz standards, and romantic-era classical compositions.

The Turnaround Chain (in C major)

I -

V/vi -

vi -

V/ii -

ii -

V/V -

V -

C -

E7 -

Am -

A7 -

Dm -

D7 -

G -

Each secondary dominant (E7, A7, D7) drives the next chord as if it were a temporary home. The result is a cascade of resolution that ends triumphantly back on I. This is the harmonic engine of gospel music.

Short Chain (Jazz Turnaround)

I -

V/ii -

ii -

V -

A single secondary dominant (V/ii) is enough to add jazz flavor to an otherwise simple I - ii - V - I. This turnaround appears in thousands of standards and neo-soul tracks.

Detect Secondary Dominants in Your Samples

BeatKey Chord Finder analyzes audio files in your browser and returns a chord timeline with timestamps. Non-diatonic chords show up alongside diatonic ones, letting you identify secondary dominants by their position and resolution.

Detect chords in your sample at chords.beatkey.app

Get the key at beatkey.app, list the 7 diatonic chords

Non-diatonic major/dom7 chords that resolve down a fifth are secondary dominants

Open Chord Finder Detect Key on BeatKey

Frequently Asked Questions

What is a secondary dominant?

A secondary dominant is a dominant seventh chord built on the fifth scale degree of a chord other than the tonic. Written as V/x ("five of x"), it temporarily tonicizes that chord, creating a strong pull toward it. For example, in C major, V/V is D7 (the dominant of G), making G feel much more like an arrival.

What is the most common secondary dominant?

The most common is V/V (five of five). In C major, that is D7. It appears in pop, gospel, country, soul, and jazz constantly because it creates the strongest possible resolution to the V chord before the final return home to I. The progression Dm - D7 - G - C is one of the most recognizable harmonic movements in Western music.

How are secondary dominants different from borrowed chords?

Secondary dominants are functional: they are dominant seventh chords targeting a specific chord a fifth below. They create forward motion. Borrowed chords come from parallel modes (Aeolian, Mixolydian, Dorian) and add color without necessarily targeting a destination. Secondary dominants propel; borrowed chords decorate. Many songs use both.

How do I find secondary dominants in a song?

Upload your audio to BeatKey Chord Finder at chords.beatkey.app. It detects the full chord progression. Then find the key with BeatKey at beatkey.app. Look for major chords or dominant seventh chords that are not in the diatonic key. If one of those chords resolves to a diatonic chord whose root sits a fifth below, it is a secondary dominant.