LEVEL 10 — Secondary Dominants
Now strengthen selected destinations.
In C:
E7 → Am
A7 → Dm
D7 → G
Use them where the phrase benefits from stronger motion.
Example:
C → E7 → Am → A7 → Dm → G7 → C
Now hear the chromatic lines:
G → G♯ → A
C → C♯ → D
This is where theory becomes voice leading.