Chord Progressions on Piano

Introduction

A chord progression is a sequence of chords that creates harmonic movement — the engine of most music. Learning the most common progressions lets you play thousands of songs and understand the harmonic language of every genre.

The Foundation: Roman Numerals

Chords in a key are named with Roman numerals:
- I — tonic (home chord)
- ii — supertonic (minor)
- iii — mediant (minor)
- IV — subdominant
- V — dominant
- vi — submediant (minor)
- vii° — leading tone (diminished)

In C major: I=C, ii=Dm, iii=Em, IV=F, V=G, vi=Am, vii°=Bdim.

Essential Progressions

I-IV-V-I

The foundation of Western music:
- C major: C - F - G - C
- Sound: complete, resolved, satisfying.
- Found in thousands of songs across every genre.

ii-V-I

The most important progression in jazz:
- C major: Dm - G - C (or Dm7 - G7 - Cmaj7)
- Sound: smooth, sophisticated, conclusive.
- The jazz equivalent of I-IV-V-I.

I-V-vi-IV

The “pop progression” — used in countless hit songs:
- C major: C - G - Am - F
- Sound: emotional, uplifting, familiar.
- Used in “Let It Be,” “No Woman No Cry,” “Someone Like You.”

I-vi-IV-V

The “50s progression":
- C major: C - Am - F - G
- Sound: nostalgic, classic, warm.
- Used in “Stand By Me,” “Earth Angel,” “Every Breath You Take.”

12-Bar Blues

The backbone of blues, rock, and early rock and roll:
- C major: C-C-C-C / F-F-C-C / G-F-C-G
- Sound: gritty, driving, bluesy.
- I-I-I-I / IV-IV-I-I / V-IV-I-V

I-IV-vi-V

A modern pop variation:
- C major: C - F - Am - G
- Sound: bittersweet, reflective, contemporary.

Transposing Progressions

To play a progression in another key, change the chord quality and root:
- I-IV-V-I in G: G - C - D - G
- I-IV-V-I in F: F - Bb - C - F
- I-V-vi-IV in G: G - D - Em - C

Practical Exercise

1. Play I-IV-V-I in C major: C - F - G - C.
2. Play it in G major: G - C - D - G.
3. Play it in F major: F - Bb - C - F.
4. Play I-V-vi-IV in C major: C - G - Am - F.
5. Play the 12-bar blues in C major.
6. Play ii-V-I in C major: Dm - G - C.

Conclusion

Chord progressions are the grammar of music. Once you know the most common progressions, you can play thousands of songs and understand the harmonic logic of any piece. Practice transposing each progression to all 12 keys.