Flat the 7th of your own tonic chord and it stops being home — it becomes 5⁷ of the 4 chord and pushes down into it. Gospel, soul, blues, jazz turnarounds: everywhere.
hear it in “Home on the Range” (C → C7 → F) · gospel standards
Lead-in — how players set it upSits naturally after a plain 1 — often at a section's last bar.From 5, so the 1⁷ reads as motion rather than arrival.Or delay it with a sus on 1 before the 7th flats.Follow — where it usually goesFrom 4, either fall home plagally or darken through 4-.Push further: 4 sours to 4- for the borrowed exit.Or make 4 a new floor — the subdominant vacation.
The 1⁷'s new b7 is the whole story: land it, then let it fall a half step onto the 4 chord's 3rd.Target tones (in C)C — lean on E (3)C7 — lean on E (3) · Bb (b7)F — lean on A (3)Half-step wiresE → F · Bb ↘ A