chord progression explained
theoryKORD proh-GRESH-un
A detailed guide to the movement from one chord to the next in a piece of music.
A chord progression is a sequence of chords played in succession, forming the harmonic backbone of a song or composition. Chord progressions create a sense of musical motion — tension, release, departure, and return. The most fundamental progression in Western music is I–IV–V–I (tonic, subdominant, dominant, tonic), which underpins countless songs from hymns to rock anthems. The I–V–vi–IV progression drives a vast number of pop hits. The twelve-bar blues progression is foundational to blues, jazz, and rock. In jazz, complex progressions like rhythm changes and ii–V–I sequences form the basis for improvisation. Roman numeral analysis labels chords by their scale degree, making progressions transferable between keys. A song's chord progression determines its emotional character — the same melody harmonised with different progressions will feel entirely different.
The I–V–vi–IV progression is so ubiquitous that the comedy group Axis of Awesome performed a medley of over 40 hit songs using nothing but those four chords.