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The dominant 7th
Take a major triad and stack one more third on top. In C major the chord lands on G–B–D–F, written G7. It is the least contented chord in tonal music — and that restlessness is the whole reason an ending sounds like an ending.
Plain prints every note in black, without the color coding.
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A major triad, plus one more third
- G major triad, then G7: one more third on top0:15
The engine: a tritone inside the chord
- The tritone B–F, resolving to C–E0:08
- G7 to C: B up to C, F down to E0:08
Its name is V7: one per key
- Three V7 chords: G7, C7, D70:09
Four notes, four positions
- G7 in four positions: G, B, D, F in the bass0:11
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