66.28Level 12 — ii–V chains

Take:

Em7 → A7 → Dm7 → G7 → Cmaj7.

Guide tones:

Em7: G-D.

A7: C♯-G.

Dm7: F-C.

G7: B-F.

Cmaj7: E-B.

Find line:

D → C♯ → C → B → B.

Very elegant.