Chord Progression Generator
Select a root key and scale mode to instantly see all seven diatonic chords, their notes, Roman numeral functions, and eight classic named progressions ready to play. Every result includes a tonal-function label so you know whether each chord is tonic, subdominant, or dominant.
What is a chord progression?
A chord progression is a sequence of chords played in order to create a sense of harmonic movement. In tonal music, chords are built by stacking intervals (usually thirds) on notes from a chosen scale. The combination of chord quality and order determines the emotional character of a piece: a I-IV-V in C major feels triumphant and resolved, while the same degrees in A minor feel darker and more introspective. Almost every genre from classical to hip-hop organises harmony around progressions, and understanding the underlying pattern lets you transpose, vary and reuse them freely.
How diatonic chord progressions work
A diatonic progression uses only chords built from notes already in the scale. For a major scale, those seven chords are: a major chord on the first degree (I), a minor chord on the second (ii), minor on the third (iii), major on the fourth (IV), major on the fifth (V), minor on the sixth (vi), and a diminished chord on the seventh (vii). Each chord is assigned a tonal function: tonic chords (I, iii, vi) provide stability and a sense of home; subdominant chords (II, IV) create a sense of motion away from home; dominant chords (V, vii) create tension that wants to resolve back to the tonic. Progressions work by moving between these functions in patterns the ear learns to anticipate.
How to use this generator
Pick a root key (the tonic note) and a mode (the pattern of intervals that determines which notes are in the scale). The generator immediately shows all seven diatonic chords for that key and mode, each with its symbol (e.g. Am), the three notes that make up the triad, its Roman numeral label, and its tonal function. Then choose a named progression from the list: the tool transposes it into your key so you can see the actual chord names to play. The Roman numeral version stays the same regardless of key, which is why musicians use this notation to describe progression shapes independent of pitch.
Common progressions and when to use them
I-IV-V is the most fundamental progression in Western popular music, underlying blues, country, early rock and gospel. I-V-vi-IV (the "pop axis") appears in hundreds of contemporary hits because it balances familiarity with emotional contrast. The ii-V-I is the harmonic engine of jazz: the ii chord (supertonic minor) introduces tension, the V (dominant) increases it, and the I (tonic) resolves it. For a darker feel, start on the vi chord (the relative minor of the tonic) to land on the emotional centre of the scale without leaving the diatonic notes. Modal progressions such as I-VII-VI in Mixolydian or i-III-VII in Dorian open up the flavour palette beyond traditional major and minor.
Understanding scale modes
A mode is a way of ordering the same set of seven intervals starting on a different degree. The major scale is the Ionian mode. Starting on the second degree gives Dorian, the third gives Phrygian, the fourth Lydian, the fifth Mixolydian, the sixth Aeolian (natural minor) and the seventh Locrian. Each mode has the same number of notes but the pattern of whole and half steps differs, which changes which chords appear on each degree and the overall emotional colour. Dorian sounds soulful (used in "Scarborough Fair", many funk basslines, and soul), Lydian sounds cinematic and open (John Williams uses it frequently), and Mixolydian sounds like a major scale that never quite wants to go home (blues-rock, classic rock).
Chord qualities by scale degree across the seven modes
| Mode | I | II | III | IV | V | VI | VII |
|---|---|---|---|---|---|---|---|
| Major (Ionian) | M | m | m | M | M | m | d |
| Dorian | m | m | M | M | m | d | M |
| Phrygian | m | M | M | m | d | M | m |
| Lydian | M | M | m | d | M | m | m |
| Mixolydian | M | m | d | M | m | m | M |
| Natural Minor (Aeolian) | m | d | M | m | m | M | M |
| Locrian | d | M | m | m | M | M | m |
M = major, m = minor, d = diminished. Each mode produces a unique pattern of chord qualities across the seven diatonic degrees.
Frequently asked questions
What are Roman numerals in chord progressions?
Roman numerals label chords by their position in the scale rather than their note name, so a progression written as I-IV-V works in every key. Uppercase numerals (I, IV, V) indicate major chords; lowercase (ii, vi) indicate minor; "dim" or a degree sign indicates diminished. This system lets musicians share and discuss progressions without specifying a key, then transpose them to any pitch by simply building the same Roman numeral pattern starting on a different root.
What is the most popular chord progression?
The I-V-vi-IV (pop axis) is probably the most recorded progression of the last four decades. In C major that is C-G-Am-F. It underlies tracks by artists ranging across virtually every popular genre. The reason it works so well is that it moves through all three tonal functions (tonic, dominant, tonic-substitute, subdominant) while always feeling familiar and emotionally balanced. The I-IV-V follows closely, especially in blues, country and folk.
What is the difference between major and minor progressions?
In a major key the tonic chord (I) is major, which gives the progression a resolved, bright or happy character. In a natural minor key (Aeolian mode) the tonic chord (i) is minor, which gives a darker, more melancholic feel. The underlying notes of the relative major and minor (e.g. C major and A minor) are identical, so a vi-IV-I-V progression in C major sounds similar to a i-VI-III-VII in A minor, but the emotional centre shifts depending on which chord feels like home.
Can I use chords from outside the scale?
Yes. Chords from outside the diatonic set are called chromatic or borrowed chords. Common examples include the IV chord borrowed from the parallel minor (e.g. using Fm in the key of C major), secondary dominants (a V chord built on a non-tonic degree, such as V/V), and modal interchange. This generator shows the diatonic foundation; once you know those seven chords you can begin substituting or borrowing freely and your ear will recognise how they differ from the expected sound.
What is the difference between a mode and a scale?
In practice the terms are often used interchangeably, but technically a mode is a specific ordering of the intervals within a scale family. The seven modes (Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, Locrian) all use the same seven interval steps as a major scale but start on different degrees. The result is a different pattern of whole and half steps, which changes the chord qualities built on each degree and the overall character of the music.
How do I choose the right key for a song?
The right key is usually the one that sits comfortably in the voice or instrument range you are writing for. For vocals, choose a key where the melody lands in the singer's comfortable middle range. For guitar, open-string-friendly keys such as E, A, G, D and C allow easy open chords. For piano, C major and A minor have no sharps or flats, making them good starting points. Capos and transposing instruments let you shift the sound without changing the chord shapes you play.
What is a cadence?
A cadence is a progression of two or more chords that creates a sense of pause, resolution or question at the end of a phrase. The most common are: the perfect (authentic) cadence V-I, which provides the strongest sense of resolution; the plagal cadence IV-I, which sounds peaceful (the "amen" ending); the imperfect (half) cadence, which ends on V, leaving a sense of question; and the deceptive cadence V-vi, which sets up resolution but swerves to the submediant instead, creating surprise. Cadences are the punctuation marks of musical phrases.