5.3 Predominant Seventh Chords

Predominant seventh chords like ii7 (and ii(half diminished)7 in minor) do the same job as predominant triads: they prepare the dominant. The big rule is that the chordal seventh resolves down by step, though it can be held in the same voice for one chord before resolving, like when ii7 moves into a cadential six four.

Why This Matters for the AP Music Theory Exam

This topic shows up wherever you have to handle four-part voice leading and harmonic function. You will use it for score analysis, error detection, writing exercises, and contextual listening, which means recognizing predominant sevenths by ear, labeling them with correct Roman numerals and figures, and resolving their tendency tones the right way.

A predominant seventh adds a dissonant chordal seventh that must be handled correctly. If you can spot ii7 and its inversions, resolve the seventh down, and avoid parallel fifths into the dominant, you protect easy points on harmonic analysis and part-writing tasks.

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Key Takeaways

• Predominant seventh chords serve the same function as predominant triads: they connect tonic to dominant in a T-PD-D-T phrase.
• The chordal seventh should resolve by a descending step in the same voice.
• The seventh can be retained in one voice before resolving down, such as when ii7 moves to a cadential six-four chord.
• ii7 usually appears in root position (ii7) or first inversion (ii6/5); the half-diminished version (ii(half-diminished)7) is the supertonic seventh in minor.
• If you drop the fifth of a root-position ii7, double the third (scale degree 4) to keep a strong predominant sound.
• Watch for parallel fifths and octaves when moving from a predominant seventh into V or V7.

Review of Predominant Triads

Before adding sevenths, remember what the main predominant chords are and how they work.

Several chords can function as predominant chords depending on context and style. In tonal music, the ii chord (minor chord on scale degree 2) and the IV chord (major chord on scale degree 4) are the common predominant choices.

Predominant harmonies (ii and IV) and their minor-key equivalents (ii° and iv) are named that way because they LEAD to the dominant. Dominant chords pull strongly toward tonic; predominant chords pull strongly toward the dominant. It is also easy to move from tonic into a predominant chord.

So phrases that were just I-V-I become I-ii-V-I or I-IV-V-I. Think of the predominant section as a preparation of the dominant. It expands the basic phrase from T-D-T into T-PD-D-T, which is more common than plain T-D-T.

If you have a piano nearby, play a I-IV-V-I progression. It probably sounds familiar, because I-IV-V-I is everywhere in both popular and classical music.

The Subdominant Triad (IV or iv)

The subdominant chord (IV in major, iv in minor) is very commonly the first predominant chord in a progression, because it sits a perfect fifth below the tonic. Moving down the circle of fifths takes you from tonic to IV.

The IV chord also makes stepwise motion easy. In F major, the I chord is F-A-C and the IV chord is Bb-D-F. You keep the common tone F, which holds onto some tonic color while still moving into the predominant area.

The Supertonic Triad (ii or ii°)

The supertonic chord, ii in major and ii° in minor, adds more harmonic interest. Just as vii° can act as a weaker substitute for V, the ii chord acts as a weaker substitute for IV. A ii chord alone is enough in the predominant section, but it often follows IV to expand it. When you use both, put IV first.

As a triad, ii chords in the predominant area are usually in first inversion (ii6 and ii°6). In first inversion, the bass is scale degree 4 (the subdominant), which strengthens the predominant function. To emphasize the subdominant even more, you can double the third in ii6 and ii°6.

Voice Leading from the Predominant to the V7 Chord

Contrary motion helps most of the time, but there are still rules to check. When a predominant chord moves to V7, the chordal seventh needs to be approached carefully, often prepared as a common tone. Remember that V7 has four notes. To avoid parallel fifths, use contrary motion and keep common tones when possible.

Using Seventh Chords in the Predominant Section

The reason for all that triad review is simple: almost everything you know about predominant triads applies to predominant seventh chords too. Predominant seventh chords fulfill the same harmonic function as predominant triads. There are just a few special cases.

Start with the supertonic seventh chord. You usually see ii7 in root position (ii7) or first inversion (ii6/5). In minor, the supertonic seventh is half-diminished (ii(half-diminished)7).

When you want a stronger predominant, first inversion (ii6/5) is preferred, because the bass becomes scale degree 4, helping the move into the dominant. Root-position ii7 also gives a strong predominant, especially when ii7 leads to V7.

In other inversions, the supertonic seventh chord might not have a predominant function at all. The ii4/2 chord, for instance, is often used over a held tonic bass to expand the tonic area, as in a I-ii4/2-I motion that keeps the tonic in the bass while the upper voices shift.

That said, ii4/2 can work as a predominant. You will most often see it lead into the dominant, as in a I-ii4/2-V6/5-I progression when it serves a predominant role.

Quick check: Can you write a I-ii4/2-V6/5-I progression in Ab major using proper voice leading? Resolve the tendency tones correctly.

Subdominant seventh chords (IV7 or iv7) are rarer in Common Practice style. When they do appear, they are usually in root position and show up more often in minor than in major.

Voice Leading with Predominant Seventh Chords

Voice leading predominant sevenths is much like voice leading other seventh chords. In root position you may omit the fifth of a seventh chord, and this is true for predominant sevenths too.

If you drop the fifth of a ii7 chord, double the third, just as you would in a triad. The third of a ii7 chord is scale degree 4, so doubling it strengthens the subdominant sound.

Always resolve the chordal seventh down by step. In a ii7 chord, the chordal seventh is scale degree 1 (the tonic). It might feel odd to move the tonic down, but resolving it down is what makes the smooth step into V or V7 work, since the leading tone is the third of the dominant chord. That leading tone then resolves up when the dominant goes to tonic, giving you clean stepwise motion in that voice.

The one exception to resolving the seventh down right away is the cadential six-four, covered in 5.6. There, the chordal seventh is retained in the same voice for one more chord before resolving down by step.

How to Use This on the AP Music Theory Exam

Using Sources Effectively

When you analyze a score, look for the dissonant chordal seventh in a predominant chord and trace where it goes. In ii7, find scale degree 1 and confirm it steps down. Label the chord and inversion with the correct figures: ii7, ii6/5, ii4/3, ii4/2 (or the half-diminished versions in minor).

Error Detection

Common errors to flag:

• A chordal seventh that leaps or rises instead of resolving down by step.
• Parallel fifths or octaves created when moving from the predominant seventh into V or V7.
• A doubled chordal seventh, which makes correct resolution awkward.

Writing Exercises

When part-writing, prepare and resolve the seventh smoothly. If you omit the fifth of a root-position ii7, double the third. Keep contrary motion against the bass into the dominant to avoid parallels. If the next chord is a cadential six-four, you can hold the seventh in the same voice before it resolves down.

Contextual Listening

By ear, a predominant seventh sounds like a predominant triad with an added pull because of the extra dissonance. Listen for that tension just before the dominant arrives, then for the seventh sliding down by step into the next chord.

Common Misconceptions

• The chordal seventh of ii7 is the tonic, and it resolves DOWN, not up. The tonic-up instinct does not apply here because the goal is smooth motion into V or V7.
• Predominant sevenths do not change the function. ii7 still acts as a predominant, just like the ii triad.
• ii6/5 is not "more advanced" than ii7. It is simply first inversion, often chosen because the bass lands on scale degree 4 for a stronger predominant.
• A ii4/2 is not automatically a predominant. In some contexts it sits over a held tonic to expand the tonic area instead.
• Holding the seventh before resolving is allowed only in specific cases, like ii7 into a cadential six-four. It is not a free pass to delay resolution anywhere.

Related AP Music Theory Guides

• 5.1 Adding Predominant Function IV (iv) and ii (ii0) to a Melodic Phrase
• 5.6 Cadential 6/4 Chords
• 5.5 Cadences and Predominant Function
• 5.7 Additional 6/4 chords
• 5.4 The iii (III) Chord
• 5.2 The vi (VI) Chord