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Music theory can be complex, but understanding cadences is essential for grasping how music feels and concludes. Two common types of cadences are plagal and authentic. This article explains the differences between them, especially for beginners.
What Is a Cadence?
A cadence is a sequence of chords that signals the end of a musical phrase or piece. It creates a sense of resolution or pause, helping to organize music and guide listeners through its structure.
Authentic Cadence
The authentic cadence, also known as a perfect cadence, typically involves the chords V (dominant) followed by I (tonic). It provides a strong sense of closure and finality.
For example, in the key of C major, an authentic cadence would be G major (V) moving to C major (I). When the V chord is in root position and the tonic chord is in root position, it sounds most conclusive.
Plagal Cadence
The plagal cadence is often called the “Amen” cadence because of its frequent use in church music. It moves from the chords IV (subdominant) to I (tonic).
In C major, this would be F major (IV) moving to C major (I). It creates a softer, more gentle sense of ending compared to the authentic cadence.
Key Differences
- Authentic cadence: V to I, strong and conclusive.
- Plagal cadence: IV to I, softer and more subdued.
- Sound: Authentic sounds more final, while plagal has a gentle feel.
- Usage: Authentic is common at the end of classical pieces; plagal is often used in religious or hymn settings.
Summary
Understanding the difference between plagal and authentic cadences helps musicians and listeners appreciate how music creates feelings of closure. While the authentic cadence provides a strong ending, the plagal offers a softer conclusion, enriching musical expression.