Random Chord Progression Generator

Deal a random chord progression from 34 patterns that run popular music, spelled into a random key -- numerals included, so it transfers anywhere. Filter by vibe, from pop anthems to cinematic.

What is a chord progression?

A chord progression is a sequence of chords played in order, and it is the harmonic skeleton nearly every piece of Western music hangs on. Progressions are usually written in roman numerals -- I, IV, V, vi -- which name each chord by its scale degree so the same pattern can be played in any key. Uppercase numerals mean major chords, lowercase minor, and the pattern's shape is what gives a song its emotional gravity: the same four chords power thousands of hits. Learning a handful of standard progressions is the fastest route from playing notes to playing songs.

About this generator

This generator deals a random chord progression from 34 patterns that actually run popular music -- the four chords of pop, the jazz two-five-one, the Andalusian cadence, Pachelbel's Canon -- spelled out in a randomly chosen key, with the numerals, the mode, and a line on the songs each pattern is famous from. Filter by vibe, from Pop Anthems to Epic & Cinematic.

Every result here is drawn using crypto.getRandomValues() -- the Web Crypto API's cryptographically secure randomness -- instead of Math.random(), so it's genuinely unpredictable, not just statistically random. Learn more.

What people use it for

Break out of the same four chords by writing over a dealt hand, practice recognizing progressions by ear in every key, warm up improvisation with fresh changes, or hand a songwriting session its starting point. Guitarists and producers use it as a creative dice roll; teachers use it for transposition drills.

How it works

Generate picks one progression pattern and one of twelve keys using the site's cryptographically secure randomness, then spells the numerals into real chord names for that key -- so I-V-vi-IV might arrive as C-G-Am-F today and E-B-C#m-A tomorrow. The Vibe filter narrows the deck to the mood you're writing for, and the caption always shows the numerals so the pattern transfers to any key you'd rather play in.

What's inside

A sample of what this generator can draw, spread evenly across the full list:

• I–V–vi–IV
• I–IV–V
• vi–IV–I–V
• I–vi–IV–V
• IV–I–V–vi
• I–IV
• I–ii–IV–V
• i–VI–III–VII
• i–iv–v
• i–VII–VI–V
• i–VI–VII
• I–III–IV–iv
• i–iv–VII–III
• ii7–V7–Imaj7
• Imaj7–vi7–ii7–V7
• iii7–vi7–ii7–V7
• Imaj7–IVmaj7
• i7–IV7
• I7–IV7–V7
• I–bVII–IV
• I–bIII–IV
• i–bVII–bVI–bVII
• V–IV–I
• I–bVII
• i–bVI–V
• I–V–vi–iii–IV–I–IV–V
• VI–VII–i
• i–bII
• I–bIII
• i–V
• I–IV–I–V
• I–IV–V–IV
• I–V–I–IV
• vi–IV–V

Common questions

What do the roman numerals mean?

They name each chord by its position in the key's scale: in C major, I is C, IV is F, V is G, vi is A minor. Uppercase means major, lowercase minor, and a 7 means a seventh chord. Numerals are how musicians share progressions key-independently.

Why does the same progression sound different in different keys?

The relationships between the chords -- the actual harmonic movement -- are identical in every key; what changes is register and playability. That's exactly why the generator re-spells patterns into random keys: it's transposition practice disguised as a dice roll.

Can I use these progressions in my own songs?

Absolutely -- chord progressions aren't copyrightable, which is why thousands of songs legally share the same four chords. The melody, lyrics, and arrangement you put on top are what's yours.

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