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What a cadence is
A cadence is the way a musical phrase ends. It is the punctuation of music. A perfect cadence is a full stop. An imperfect cadence is a comma or a question mark. A plagal cadence is a gentle sigh. An interrupted cadence is a sentence that swerves at the last word. Every phrase you have ever heard ends with one of these gestures, whether the composer planned it or not.
Cadences work because of the pull between chords. In a major key, the dominant chord, built on the fifth note of the scale, pulls strongly toward the tonic, the home chord. The subdominant, built on the fourth note, pulls more gently. The sixth chord, the submediant, sounds like a detour. Cadence names simply describe which of these pulls ends a phrase.
The four classic cadences
The perfect cadence, also called authentic, runs from dominant to tonic, V to I. It is the strongest ending in Western music, the sound of arrival. Hymns, anthems and pop choruses end with it because it tells the listener that the journey is over. In C major, that is G to C.
The plagal cadence runs from subdominant to tonic, IV to I. It is softer than the perfect cadence, famous as the Amen ending of hymns. In C major, that is F to C. Songwriters use it when they want an ending that feels warm rather than triumphant.
The imperfect cadence, also called half cadence, ends on the dominant, V. It can start from almost any chord: I to V, ii to V, or IV to V all count. It leaves the music open, like a question waiting for an answer. Verses often end this way so the listener expects the chorus to follow.
The interrupted cadence, also called deceptive, runs from dominant to somewhere unexpected, usually vi, V to vi. The ear expects the tonic and gets the submediant instead. It is a surprise that keeps a song going: the ending is delayed, and the listener stays engaged for one more phrase. In C major, that is G to Am.
How to use the identifier
Pick a major key, then pick the two chords that end your phrase, using their scale degrees. The identifier names the chords in that key and tells you which cadence they form, or says honestly that the pair is not one of the four classic types. Not every chord pair is a cadence, and that is useful information too: a pair that is not a cadence is usually a passing progression inside a phrase, not an ending.
Try the same pair in different keys. The cadence type depends on the degrees, not the chord names, so V to I is a perfect cadence in every major key. This is why Roman numerals matter: they describe function, the job a chord does, rather than just its name.
Why cadences matter for songwriting
Cadences control expectation, and expectation is the engine of musical feeling. A verse that ends on an imperfect cadence makes the chorus feel like an answer. A bridge that ends on an interrupted cadence makes the final chorus feel earned. A song that ends every phrase with a perfect cadence can feel predictable, while one that never lands on a perfect cadence can feel restless.
Listen to songs you love and name the cadence at the end of each phrase. You will start hearing patterns: verses asking questions, choruses giving answers, and bridges delaying the answer with a deceptive move. That listening skill is worth more than any single tool, and this identifier is a shortcut to building it.
Common mistakes
The most common mistake is calling any V to I movement a perfect cadence regardless of context. A cadence is a phrase ending, so the same two chords in the middle of a phrase are just a progression. Another mistake is confusing plagal and perfect cadences: remember, plagal starts on IV, perfect starts on V. Finally, do not force every ending into the four boxes. Music from other traditions, and much modern pop, uses endings that sit outside this system, and that is fine.
Use the identifier to check your endings, then trust your ear. If a cadence sounds right for the moment in your song, it is right, whatever its name.
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