Secondary dominants and approach chords: the complete guide on guitar

On the guitar, with its six strings tuned E–A–D–G–B–E, a secondary dominant can be shown in full: the walking bass, the chromatic leading tone resolving, and the top voice singing — all in one hand. Few settings make the technique as transparent as a well-driven guitar.

Reference shapes

V7/vi in C major: the G sharp inside the open shape leads to Am — the secondary dominant most present in Brazilian popular music.

V7/ii: the open A string gives you the bass for free while the fingers show C sharp and G, the pair that pulls toward Dm.

V7/V: it sets up G with the F sharp clearly audible in the top voice of the open shape.

V7/iii: a classic open shape resolving to Em; great for feeling two chromatic notes at once.

V7/IV: just add the seventh (B flat) to C and the tonic chord becomes an arrow pointing to F.

The main dominant, the point of comparison: every secondary dominant imitates this pull at another address in the key.

What changes on the guitar

The range from low to high is the great asset. The two lowest strings let the thumb draw the path of the roots — A falling to D, D falling to G — while the other fingers handle the third and the seventh, the notes that actually create the pull. In other words: on the guitar you don't just play the secondary dominant, you tell it as a little story, from bass to melody.

Another advantage: the most-used dominants in the key of C — E7, A7, D7 and B7 — have first-position shapes with open strings, which helps sustain the chromatic leading tone until it resolves. Let that note ring; if it dies before the next chord, the listener loses precisely the thread that connects the two chords.

Role in the arrangement and styles

In MPB, bossa nova and samba-canção, the guitar is often the entire harmony: secondary dominants appear in every phrase, frequently preceded by their related ii. In sertanejo and acoustic pop, they show up at strategic points — typically the E7 on the way to Am, or the D7 setting up the arrival of the chorus. In solo arranging, the choice of shape starts to depend on the melody: the top voice must keep singing above the tension.

Common mistakes on the guitar

Muting the leading tone inside a barre: in closed shapes, a neighboring finger brushes the string with the chromatic note and it simply vanishes.
Changing chords too late and swallowing the bass — the path of the roots is half the effect.
Using full shapes when bass, third and seventh would be enough, especially at fast tempos.
Practicing each shape in isolation: what needs to be clean is the change (E7 moving to Am, for example), not the chord standing still.

Open shape or barre for secondary dominants?

Start with the open ones: they sustain the chromatic leading tone better and free your attention for the timing of the resolution. Move to barre shapes when the melody or the arrangement's register asks for the same function higher up the neck.

How do I practice the walking bass without losing the groove?

Split it into layers: first only the thumb playing the roots in time, then only the third and seventh, and finally both layers together at a slow tempo. The full groove comes back last, once the changes no longer require looking at your hand.

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References

Content reviewed against the standard harmony literature — verified bibliography below.

Almir Chediak — Harmonia & Improvisação, vols. 1–2 (Lumiar Editora)
Ian Guest — Harmonia: Método Prático (Irmãos Vitale)
Nelson Faria — A Arte da Improvisação (Lumiar Editora, 1991)
William Leavitt — A Modern Method for Guitar (Berklee Press)
Carlos Almada — Harmonia Funcional (Editora da Unicamp, 2009; 2ª ed. 2012)
Bohumil Med — Teoria da Música (Musimed)

Updated July 9, 2026