Chord Progression Generator
Generate the chords of popular progressions (I–V–vi–IV, ii–V–I, 12-bar blues …) in any major or minor key, free online.
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Chords are built from the scale degrees of the key. In a major key the triads are I, ii, iii, IV, V, vi, vii°; in natural minor they are i, ii°, III, iv, v, VI, VII. Pick a key and a progression to see the chord names and their notes.