Why some chord endings feel final and others leave you hanging
Every time a hymn closes on Amen, the harmony is doing something precise: stepping from the chord built on the fourth note of the scale back home to the first. Musicians call such phrase endings cadences, from the Latin for falling, and composers from Bach to Mahler have used them to satisfy or trick listeners.
A cadence marks the close of a phrase, giving a feeling of full or partial resolution. It might be a pattern of chords, or simply a rhythm that signals an ending, and theorists grade cadences as strong or weak by how final they sound. Crucially, the right chords alone are not enough; there has to be a genuine sense of arrival. Because they point so clearly to a piece's home note, the musicologist Edward Lowinsky called cadences the cradle of tonality.
Four families dominate. The authentic cadence moves from the dominant chord to the tonic, and one dictionary describes it as a microcosm of the whole tonal system. When both chords sit in root position with the home note on top, it becomes a perfect authentic cadence, the strongest close of all, which William Caplin says achieves complete harmonic and melodic closure. A half cadence instead stops on the dominant, sounding suspended and demanding more. The plagal cadence is the Amen progression, although Caplin argues it rarely forms a true close in classical works. Most mischievous is the deceptive cadence, where the dominant swerves to an unexpected chord, often the one built on the sixth degree.
Composers exploit that swerve. Brahms, in the opening movement of his Third Symphony, races toward what sounds like an E minor arrival and then sidesteps into C major, and Mahler opens the finale of his Ninth Symphony with a string of these false endings. Pop uses it too: a Pink Floyd track, Bring the Boys Back Home, finishes on one.
Other flavours carry history in their names. The Phrygian cadence, a relic of Renaissance modes, sounds archaic and often linked a slow Baroque movement to a fast one. The Picardy third brightens a minor-key piece by ending on a major chord, as Bach does in Jesu, meine Freude. Earlier still, medieval closes were built from pairs of voices converging on an octave or unison, a practice Guido of Arezzo first described.
Source: Cadence
