Select a key (major or minor), click diatonic chords to build a sequence, and hear it all played back in a loop. Built-in presets cover the pop standard, jazz turnarounds, 12-bar blues, and others.
Diatonic Chords
Preset Progressions
Your Progression
Pick a key and all seven diatonic chords appear. Click any chord to hear it on its own, then stack them into a progression. The built-in presets give you a starting point if you want one, or build from scratch. Hit Play and the whole thing loops so you can hear how the chords move together.
A sequence of chords that forms the harmony of a song. The repeating chord pattern you hear in the verse or chorus, that is the progression. Roman numerals (I, IV, V, vi) keep it key-neutral so the same pattern works in C, G, or any other key.
I-V-vi-IV. In C that means C-G-Am-F. You have heard it in hundreds of songs without realizing. It balances bright and emotional in a way that just lands, which is why songwriters keep coming back to it.
Chords built entirely from the notes of a single scale. In any major key the pattern goes: major, minor, minor, major, major, minor, diminished. Always. That predictability is why certain chords feel like they belong together. They are all diatonic to the same key.
Grab a structure that works and make it your own. I-V-vi-IV is a solid starting point. Swap one chord out, see how the feel changes. Try the same thing in a minor key. Try the 12-bar blues pattern. Starting from something proven and tweaking it is more productive than staring at a blank page.