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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.
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]
In this ordering, the progression ends with a double plagal cadence in the key of the dominant (in the Mixolydian mode) and could also be respelled ii–bVII–IV–I, opening with a backdoor turnaround. The chord progression is also used in the form IV–I–V–vi, as in songs such as "Umbrella" by Rihanna [5] and "Down" by Jay Sean. [6]
Otherwise explained: if the melody moves mostly above the final, with an occasional cadence to the sub-final, the mode is authentic. Plagal modes shift range and also explore the fourth below the final as well as the fifth above. In both cases, the strict ambitus of the mode is one octave. A melody that remains confined to the mode's ambitus is ...
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Backdoor compared with the dominant (front door) in the chromatic circle: they share two tones and are transpositionally equivalent. In jazz and jazz harmony, the chord progression from iv 7 to ♭ VII 7 to I (the tonic or "home" chord) has been nicknamed the backdoor progression [1] [2] or the backdoor ii-V, as described by jazz theorist and author Jerry Coker.
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?
Plagal may refer to: Plagal cadence (in music) Plagal mode (in music) Pro-Life Alliance of Gays and Lesbians (PLAGAL) This page was last edited on ...