Phrase Endings and the Picardy Third

A piece in minor usually ends on a minor tonic triad, root, minor third, fifth. The Picardy third raises that third by a half step, so the final chord becomes major instead. Nothing else changes: same root, same fifth, same function as the resting point of the whole piece. The effect is a surprising brightness right at the end, like the music steps into major light just before it closes. It is a stylistic choice, common in Baroque music especially, not something every minor-key piece does.

This sits inside the bigger picture of cadences, the harmonic punctuation marks that divide a continuous passage into phrases. A cadence is a progression, often dominant to tonic, that signals arrival: a half cadence pauses on the dominant, an authentic cadence lands on tonic. Phrases are the musical sentences between these punctuation points. The Picardy third shows up specifically at a final cadence, dressing up the last tonic chord of the piece or a major section.

The Picardy third connects directly to harmonic minor, the scale already built with a raised seventh degree to create a leading tone that pulls strongly to tonic. That raised seventh sharpens the dominant chord into a major triad, which strengthens the pull to tonic at a cadence. The Picardy third extends that same brightening instinct to the tonic chord itself: having used a raised tone to sharpen the approach, the final chord gets raised too, so the ending matches the brightness of the music that resolved into it.