What is a defining feature of the Plagal Cadence (PC)?

The defining feature of the Plagal Cadence is indeed the resolution from IV to I. This cadence, often referred to as the "Amen Cadence" in choral music, creates a sense of closure and finality, typically heard at the end of hymns or religious music.

In tonal music, the IV chord (subdominant) leads smoothly to the I chord (tonic), establishing a restful conclusion to a phrase or composition. This movement emphasizes the relationship between these two chords within the key and contributes to the overall structural coherence of the musical piece. The Plagal Cadence offers a different resolution than the more dominant-driven perfect cadence (V to I), showcasing its unique role in harmonic progression.

Understanding the IV to I progression is essential for recognizing how cadences function within a broader context of composition and can influence the emotional quality of the music.