The chords that every MIREX 2026 chord system (and the two baselines) reads from songs none of them could have seen: Creative Commons releases published in October 2026. Two songs are not enough to rank the systems (the 2026 results page does that), but they give an intuition of how each one performs on individual pieces.
This page is best viewed on a computer: the timelines need a wide screen. On a phone, tap a chord to hear it and swipe sideways on a timeline to scroll it.
How to use: press play (or Space). Click a chord to hear it on the piano; click a system's name to have the piano play that system's chords along with the song, so wrong chords can be heard against the music. Click the time ruler or the overview strip to jump.