Functional Box I — voice-leading the ii-V-I

The voice-leading table

Read each row as one ii-V-I cycle. The upper-structure intervals are written from low to high: 1=root, 3=3rd, 5=5th, 7=major 7th, ♭7=minor 7th, 9=9th, ♭9=flat 9, ♯9=sharp 9, ♯11=sharp 11, 13=13th, ♭13=flat 13.

How the voice leading works

The genius of this system is that the IIm7 voicing — ♭3–5–♭7–9 — already shares three of its four notes with a Box I shape. Holding that shape steady through the bar of ii means you only have to move two notes (or fewer) to reach the V7 alteration. The I chord then resolves by step. Most of the “motion” in a ii-V-I happens in the bass and not in the upper voices, which is why this feels effortless once it's under your fingers.

The six rows let you pick the dominant colour on the fly. Box 1 gives you a stock dominant with the natural 13. Alt swaps in ♯9 and ♭13 for tension. Box 2 uses the ♭9 + ♭13 combination. Box 3 trades the 13 for a ♯11 (lydian dominant) . Box 5 stacks ♭9 ♯11 13 (half-whole diminished sound). Box 4 is the simplest — just ♭7 9 3 5, the classic guide tones.

Practice routine

1. Pick a key. In C major, the ii-V-I is Dm7 → G7 → Cmaj7.
2. Voice the IIm7 — Dm7 = F–A–C–E (♭3–5–♭7–9). Hold this shape for a full bar.
3. Move to the V7 row of your choice. For row 1 (Box 1), G7 = F–A–B–E (♭7–9–3–13).
4. Land the I — Cmaj7 = E–G–B–D (3–5–7–9).
5. Now do the same in F major, then B♭, then E♭ — circle of fourths until you can hear each row blindfolded.

Try it in a tool

Use the Chord Finder to confirm your spelling for any IIm7, V7, or Imaj7 in any key — then drill the progression on the Chord Drill.