Embedded Files
Objectives
Objectives
By the end of this lesson, students will be able to:
Describe what plagal motion and plagal cadences are in the context of the phrase model.
Explain how the IV chord works to prolong tonic harmony and describe plagal motion using functional labels.
Identify examples of plagal motion in examples from the repertoire.
Compose a progression that uses plagal motion as a form of prolongation and partwrite the progression in 4-voice keyboard or chorale style.
Harmonize a given melody using plagal motion as prolongation.
Preparation for Class
Preparation for Class
Read:
Read:
Plagal Motion as a Form of Prolongation (John Peterson, OMT)
Watch
Watch
What is a Plagal Cadence?
Music Theory Crash Course (5 mins)
In-Class Activities
In-Class Activities
Discussion
Discussion
Definitions: What is plagal motion? How is plagal motion used to prolong the tonic in the beginning, middle, and end of the phrase? Provide examples of chord progressions for each. (See the reading for examples.)
Activities
Activities
Worksheet: Complete the Plagal Motion worksheet from Open Music Theory.
Composition: Compose two 4-bar chord progressions in different meters and keys. The first progression should use plagal motion to prolong tonic at the beginning of the phrase; the second should use plagal motion at the end of phrase as part of a plagal cadence. Partwrite one progression in chorale style and the other in keyboard style. Label the cadences. Identify Roman numerals and chord function (T, PD, D) below the staff. If there's time, also compose a melody for the chord progression.
Analysis: Analyze examples from the repertoire in the Anthology section below. Identify Roman numerals, chord function (T, PD, D), cadences, and non-chord tones by type.
Repertoire for Practice
Repertoire for Practice
Tonic Prolongation with IV: Examples for analysis that use IV as part of a tonic prolongation. See the section titled "Tonic Prolongation using IV."
Plagal and Deceptive Cadences: Examples from the repertoire that end with either a Plagal or Deceptive cadence. (Instructor Note: The instructor anthology separates the plagal cadences into a separate section).
Want to learn more?
Want to learn more?
Explore some of the different ways that the IV chord functions in popular music in this reading by David Temperly:
David Temperly, “The Cadential IV in Rock.” Music Theory Online 17, no. 1 (2011).
Practice
Practice
Musition:
Cadences: Level 3 and 8
Four-Part Writing: Levels 13a, 13b
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