A cadence is a harmonic formula that ends a musical phrase, functioning like punctuation in language. Just as sentences end with periods, question marks, or ellipses, musical phrases conclude with cadences that communicate finality, suspense, or surprise. Cadences are built from the functional relationships between diatonic chords, and recognizing them is essential for understanding musical form.
The perfect cadence moves from dominant to tonic (V → I) and is the strongest resolution in tonal music. It communicates finality—a clear arrival at "home." Nearly every piece of tonal music ends with a perfect cadence because no other chord motion provides the same sense of closure.
The resolution is powered by two tendency tones: the leading tone (B) resolving up by half step to the tonic (C), and the fourth degree (F) resolving down to the third (E). When the V chord includes a seventh (G7), these tones form a tritone whose resolution is even more compelling.
In A minor: E → Am (using harmonic minor's raised seventh)
The plagal cadence moves from subdominant to tonic (IV → I). It provides a gentler, warmer resolution than the perfect cadence—less dramatic, more serene. It's sometimes called the "amen cadence" because of its use at the end of hymns.
The plagal cadence works differently from the perfect cadence. Instead of tritone resolution, it relies on the common tone between IV and I (C appears in both F major and C major in this key) and the stepwise descent of the fourth degree to the third (F moving to E). This creates resolution through gentle voice motion rather than harmonic tension.
Plagal cadences often appear after a perfect cadence as a coda or tag, adding a final confirmation of the tonic. Pop and gospel music use plagal cadences frequently, both as phrase endings and as the primary cadential gesture of an entire song.
The half cadence ends on the dominant (V) rather than resolving to tonic. It sounds incomplete and expectant—like a question waiting for an answer, or a comma in the middle of a sentence. Half cadences typically appear at the midpoint of a musical period, setting up the second phrase to resolve with a perfect cadence.
In C major: any chord → G
Common approaches include I → V, ii → V, and IV → V:
Half cadences are structurally important because they create the expectation that drives a piece forward. In classical sonata form, the first phrase of a theme often ends with a half cadence, and the second phrase answers with a perfect cadence. This antecedent-consequent pairing (question-answer) is one of the most fundamental structures in Western music.
The deceptive cadence starts like a perfect cadence (V) but resolves somewhere unexpected—typically to vi instead of I. The dominant creates its usual tension, but the resolution surprises by landing on the relative minor instead of the tonic.
In C major: G → Am (V → vi instead of V → I)
The deceptive cadence works because vi shares two notes with I (in C major, Am contains A-C-E while C major contains C-E-G—they share C and E). The leading tone still resolves upward (B to C), but the bass moves up to A instead of down to C, creating a subtle misdirection rather than a jarring surprise.
Composers use deceptive cadences to extend phrases that would otherwise end too soon, delay a final resolution to build anticipation, or add emotional complexity at key moments. A deceptive cadence almost always leads to a "second attempt" at a perfect cadence, making the eventual resolution more satisfying.
Real music rarely uses cadences in isolation. They work together to shape musical form. A typical phrase structure might use a half cadence at the midpoint and a perfect cadence at the end, with the occasional deceptive cadence to extend the phrase when the music needs more time before resolving.
Understanding cadences transforms how you hear music. When you recognize an approaching dominant chord, you begin anticipating the resolution—and when the composer confirms or subverts that expectation, you experience the emotional arc that makes tonal music compelling. This interplay of expectation and fulfillment is at the heart of functional harmony and drives every chord progression you'll encounter.