4.7Now add simple seventh chords

Am7:

A C E G

Dm7:

D F A C

G7:

G B D F

Cmaj7:

C E G B

Fmaj7:

F A C E

Bm7♭5:

B D F A

E7:

E G♯ B D

Am7:

A C E G

That single G♯ is crucial.