Why does a chord progression feel like it is coming home?
A dominant seventh chord holds a tritone, and its two restless notes both want to slide into the home chord.
▶ Start the storyA chord progression feels like it is going home because certain notes in the chord before the last one are unstable and pull toward notes of the final chord. The classic case is the authentic cadence, a move from the dominant chord (built on the fifth note of the scale, V) to the tonic chord (I), the chord of home. In C major that is G7 going to C.
Add the seventh to the dominant and the pull gets strong. G7 contains G, B, D and F, and the B and the F, a tritone apart, produce a clashing sound that gives the dominant seventh its dissonant, unstable quality. B is the leading tone, with a strong tendency to rise to the tonic C. F is a half-step above E and leads down to it. Both hold-ups resolve at once into the notes of the C chord, with the bass also moving by a fifth. One analysis calls this chord the central propulsive force in our music.
Step 1: G7 sounds
Notes G, B, D, F: a tritone between B and F.
Step 2: B pulls up
The leading tone rises to C.
Step 3: F falls
It slips down a half-step to E.
Step 4: C chord arrives
Tension released; the bass moves by a fifth.
Composers also play with the expectation. A half cadence stops on V and sounds incomplete or suspended, calling for continuation. A deceptive cadence goes from V to a chord other than the tonic, usually the submediant, and the hanging feeling it creates is a deliberate trick on your ear. The historian Edward Lowinsky even called the cadence the "cradle of tonality", and cadences are strong indicators of the tonic, the home note of a passage.
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Recap
The dominant seventh holds a tritone whose two restless notes both resolve into the tonic chord, which is why V to I feels like arriving home.
💡 A trick to remember it · V7 is a suitcase half-packed with two restless notes; I is the front door they both walk through.
Surprising fact · Whether the Amen cadence (IV to I) counts as a real cadence has been disputed by theorists.
Connects to
- 🎡 What is the circle of fifths, and why do musicians use it as a map?
- 🎶 Why do some notes sound good together while others clash?
- 😈 Was the 'devil's interval' really banned by the Church?
- 🎺 How can a bugle play a tune with no valves or keys?
- 🔮 How does your brain predict what a song will do next?
- 🔮 Does your brain see the world, or predict it?
Sources (3)
No source, no claim. Every fact in this lesson (21 claims) cites at least one of these.