Generate chord progression

Convert scale-degree numbers into diatonic triad symbols for a selected major or natural-minor key.

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ToolChord Progression Generator
Input
Output
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Preview

How it works

Degree numbers select roots from seven major or natural-minor offsets, then fixed triad-quality patterns append major, minor, or diminished quality. Major follows I–ii–iii–IV–V–vi–vii°, while natural minor follows i–ii°–III–iv–v–VI–VII.

  • The starting 1 5 6 4 sequence is only an editable example.
  • Roots use sharp spellings because the pitch-class list has no flat or double-accidental notation.

Worked example

Generate chord progression
Input
											Key: C
Degrees: 1 5 6 4
Mode: major
Output
												C – G – Am – F

When to use this

Songwriters realize I–V–vi–IV in a chosen key, harmony exercises inspect triad quality, and rehearsals turn degree sketches into playable roots.

Edge cases

  • Numbers below 1 or above 7 are rejected because each diatonic pattern contains seven roots.
  • F major outputs A# rather than the conventionally spelled Bb.
  • Minor mode keeps the natural-minor v chord and does not raise degree seven to create a major V.