12.23Secondary dominants in G major

G major chords:

G Am Bm C D Em F♯°

Secondary dominants:

To Am:

E7 → Am

To Bm:

F♯7 → Bm

To C:

G7 → C

To D:

A7 → D

To Em:

B7 → Em

Primary dominant:

D7 → G

Notice how the exact chord names change, but the logic is identical.