The strongest harmonic resolution in music: the dominant seventh V⁷ resolves to the tonic I. Creates a sense of complete conclusion for a phrase or piece.
The tense sound of the dominant seventh gives way to complete rest on the tonic. A pronounced sense of finality. Tension is high, stability after resolution is total.
V⁷ (Dominant): contains the leading tone and tritone — the two main sources of tension in functional harmony. The tritone between scale degrees 3 and 7 demands resolution. I (Tonic): the point of rest, the tonal center. All other chords gravitate toward it. When V⁷ arrives at I, the circle closes. Why it works: the fifth-based relationship V→I is the strongest harmonic pull. Adding the seventh to V intensifies the tritone tension, making the resolution even more convincing.
Tension is concentrated in V⁷: the tritone between the 3rd and 7th scale degrees creates pronounced gravitational pull. The 7th degree (leading tone) — one of the most tense notes in the scale — pulls upward to the tonic. The 4th degree pulls down to the 3rd. Resolution to I releases the tension.
Universal across all major keys. The structural cadence of classical form: ends periods, sections, and entire pieces. In pop, often at the end of a chorus. In jazz — the final of a standard (with a possible ii before V).
V⁹-I (extended dominant), V¹³-I (jazz variant), V-I with suspension (sus4→3 in melody), subdominant expansion: IV-V⁷-I or ii-V⁷-I. V⁷ can be replaced with V⁷#5 for a brighter sound.
On guitar, V⁷-I is available in all fretboard positions. The key principle is minimal finger movement (voice leading). Open position (key of C): G7 (320001) → C (x32010) — classic transition, shared finger on 3rd string. Barre at 3rd fret (key of G): D7 (x5453x) → G (355433) — or use E/A-shape barre forms. Higher positions: use CAGED shapes to find V⁷ and I near each other. Voice leading: keep common tones in place, move other voices by the smallest interval possible.