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A piano reference: chords, scales, theory & ear training.
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Note identifier · Reference

What chord is this?

Give the notes, get the answer: a ranked reading with every note mapped to its degree, the chords the set is often mistaken for (and the exact tone that rules each out), plus the set-class analysis. Play a chord live at What am I playing?

Common note-sets

Start from one of these, or edit the notes in the URL.