29.64Voice-leading graph

Take:

Cmaj7 → A7 → Dm7 → G7 → C.

Pick four voices.

For example:

Bass: C → A → D → G → C

Tenor: G → G → F → F → E

Alto: B → C♯ → C → B → B

Soprano: E → E → F → F → E.

Play each line separately.

Then combine.

This is hugely educational.