Key changes can descend too. Give the 4 chord a dominant 7 and it re-badges as 5⁷ of the key a whole step down — the sound of a song exhaling after a big section.
hear it in verse resets after big choruses
Lead-in — how players set it upGive 4 a dominant 7th and it re-badges itself.Or reach 4⁷ through the walk: 4, #4°⁷ feint, back to 4⁷.Or from 2-⁷ — a ii–V aimed a whole step under home.Follow — where it usually goesSettle: the lower key wants calmer material.Settle with the new key's plagal amen — calm confirmed.Or climb back up later via the mirror — new 2⁷ is a lift home.
The old 4's root is the new 5's root — drum on that shared note while the function flips beneath it.Target tones (in C)C — lean on E (3)F7 — lean on A (3) · Eb (b7)Bb — lean on D (3)Half-step wiresE → F · A → Bb · Eb ↘ DAcross the borderno shared tonic tones with Bb — cut clean and re-land