Build Better Chord Progressions
The Chord Progression Builder helps you discover and experiment with diatonic harmony. By working within a key, every chord you select naturally fits together — making it easier to create music that sounds intentional and cohesive.
Whether you're a beginner learning the basics of harmony or an experienced musician exploring new key centers, this tool gives you instant feedback through audio playback and visual Roman numeral analysis. Understanding the function of each chord (tonic, dominant, subdominant) is the key to writing better progressions.
Popular Progressions to Try
- I–V–vi–IV: The most popular pop progression (C–G–Am–F in C major)
- I–IV–V: The classic blues and rock foundation
- ii–V–I: The essential jazz turnaround
- i–VI–III–VII: The iconic minor-key progression
- I–vi–IV–V: The 1950s doo-wop progression
Relative Minor Keys
Every major key has a relative minor that shares the same notes but centers on a different root. For example, C major's relative minor is A minor — both use the same set of natural notes but with different tonal centers. Try switching between a major key and its relative minor to hear how the emotional character changes while using the same chords.