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The rare plagal half cadence involves a I–IV progression. Like an authentic cadence (V–I), the plagal half cadence involves an ascending fourth (or, by inversion, a descending fifth). [17] The plagal half cadence is a weak cadence, ordinarily at the ending of an antecedent phrase, after which a consequent phrase commences.
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Traditional sub-Saharan African harmony is a music theory of harmony in sub-Saharan African music based on the principles of homophonic parallelism (chords based around a leading melody that follow its rhythm and contour), homophonic polyphony (independent parts moving together), counter-melody (secondary melody) and ostinato-variation (variations based on a repeated theme).
This was the plagal mode corresponding to the authentic Dorian, and was called the Hypodorian mode. [6] In the untransposed form on D, in both the authentic and plagal forms the note C is often raised to C ♯ to form a leading tone, and the variable sixth step is in general B ♮ in ascending lines and B ♭ in descent. [7]
[4] He states that the progression I–ii–V–I (an authentic cadence) would feel more final or resolved than I–IV–I (a plagal cadence). Goldman [ 5 ] concurs with Nattiez, who argues that "the chord on the fourth degree appears long before the chord on II, and the subsequent final I, in the progression I–IV–vii o –iii–vi–ii–V ...
In the plagal cadence, it appears as the falling of the subdominant to the mediant. It also occurs in many forms of the imperfect cadence, wherever the tonic falls to the leading-tone. Harmonically, the interval usually occurs as some form of dissonance or a nonchord tone that is not part of the functional harmony.
This is a plagal cadence featuring a dominant seventh tonic (I or V/IV) chord. However, Baker cites a turnaround containing "How Dry I Am" as the "absolutely most commonly used blues turnaround". [5] Fischer describes the turnaround as the last two measures of the blues form, or I 7 and V 7, with variations including I 7 –IV 7 –I 7 –V 7. [6]
I have a question concerning the plagal cadence section. Apparently, a minor plagal cadence is known as the "backdoor progression". However, my definition of a minor plagal cadence is the use of the minor iv chord in a major key instead of the regular IV chord. Heavenlycheese 00:09, 14 September 2011 (UTC)Ed . What is your question?