Chords in the Key of C Major

Diatonic triads

Seventh chords

Stack one more scale tone on each triad and you get the seventh chords — same key, more color.

Common progressions in C major

• I–V–vi–IV

  C – G – Am – F

  The four-chord pop loop — a huge share of modern radio runs on it.

• I–IV–V

  C – F – G

  The three-chord workhorse behind blues, folk, and early rock and roll.

• ii–V–I

  Dm – G – C

  The jazz cadence — the strongest pull back home in the key.

• I–vi–IV–V

  C – Am – F – G

  The '50s doo-wop turnaround, still everywhere in ballads.

How the key of C major works

C Major carries no sharps or flats — all seven notes are naturals. The scale runs C–D–E–F–G–A–B, and stacking every other note of that scale builds the seven chords above without borrowing a single note from outside the key.

A Minor is the relative minor: identical key signature, identical seven chords. A song that treats Am — the vi chord here — as home base is in A minor, even though its chord inventory matches this page exactly.

The parallel minor, C Minor, keeps the same root but flattens the third, sixth, and seventh — its signature shifts to three flats (Bb, Eb and Ab). Borrowing chords across that line is where a lot of songwriting color comes from.

Keep practicing

• Practice the C major scale on the fretboard
• Jam these progressions over a backing track
• Transpose a song into or out of C major