Guitar Theory
What Is a Chord Progression?
A chord progression is a sequence of chords played in order. Most songs in Western music use the same handful of progressions. Understanding how they work explains why certain songs feel resolved, tense, happy, or melancholic, and helps you solo over them with intention.
Chords from a key
Most progressions are built from diatonic chords, meaning all the chords come from the same key. In the key of G major, the diatonic chords are G, Am, Bm, C, D, Em, and F#dim. A progression in G major picks some of those chords and arranges them in a sequence.
Because all the chords share notes from the same scale, you can use that scale over the entire progression. The scale fits all the chords. That is the core practical benefit of understanding diatonic harmony.
The most common progressions
I - IV - V
G - C - D (in G major)The most common progression in rock, country, and blues. Three major chords, all bright. The V chord creates tension that the I chord resolves. La Bamba, Johnny B. Goode, and hundreds of blues songs use this exact pattern.
How to solo over I-IV-V →I - V - vi - IV
G - D - Em - C (in G major)One of the most recorded progressions of the last 50 years. Let It Be, No Woman No Cry, and hundreds of pop and rock songs use this pattern. The vi minor chord adds emotional weight after the two major chords.
i - bVI - bVII
Am - F - G (in A minor)The standard rock minor key progression. Stairway to Heaven, Smoke on the Water, and most anthemic minor key rock songs live here. All three chords are natural minor diatonic.
How to solo over a minor progression →ii - V - I
Dm7 - G7 - Cmaj7 (in C major)The foundation of jazz harmony. The ii chord sets up the V, which resolves to I with maximum force. Every jazz standard uses this pattern in some form.
How to solo over ii-V-I →12-bar blues
I - I - I - I - IV - IV - I - I - V - IV - I - VThe backbone of blues, rock and roll, and early rock. Four bars of I, two bars of IV, two bars of I, one bar of V, one bar of IV, two bars of I with a turnaround. Thousands of songs are built on this form.
Tension and resolution
Every chord in a progression has a level of tension relative to the key. The I chord is home, fully resolved. The V chord has the most tension and wants to resolve back to I more than any other chord. The ii and IV chords create softer tension. The vii diminished chord has extreme tension.
A good progression creates a cycle of tension and release. Building through IV or ii to V, then resolving to I, gives the listener a harmonic arc. When that arc is clear, solos that follow the changes sound intentional and musical rather than random.
Non-diatonic chords
Many progressions borrow chords from outside the key. A I-IV-bVII progression in a major key uses the bVII chord from the parallel minor. The bVII creates a looser, rock sound and is one of the most common borrowed chords in guitar music. Songs like Hey Joe and All Along the Watchtower use borrowed chords throughout.
The relative major and minor relationship explains why borrowed chords work: the parallel minor shares many of the same notes as the major key, so borrowed chords do not feel completely foreign.
See chord progressions on the fretboard
Load any key in the Scale Mapper and enable diatonic triads. Each chord is color-coded by scale degree so you can see which chords belong to the key and where their notes fall.
Open Scale Mapper →