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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.
More recent definitions, especially by American theorists, have tightened the use of the term to restrict the contrast so that the first phrase must end in a half cadence or imperfect authentic cadence and the second a perfect authentic cadence. [10] [11]
The MC is often triggered by repeated, declamatory ("hammer blow") chords and follows either a half cadence or authentic cadence in the tonic or secondary key. (The first level default is to build an MC around a half cadence in the new key; by far the least common option is to set the MC up by an authentic cadence in the tonic.)
In the strongest cadence, the authentic cadence (example shown below), the dominant chord is followed by the tonic chord. A cadence that ends with a dominant chord is called a half cadence or an "imperfect cadence".
The second movement is a lyrical Adagio with many embellishments. It is in "sonatina" form (there is no development section, only a single bar of a rolled V 7 chord (E♭ 7) leading back to the tonic key); [2] an apparent third appearance of the main theme turns into a coda, imitating a cello solo, [2] which slowly fades to a final perfect cadence.
Half of the third movement is also done. ... the essential closure is an imperfect authentic cadence (IAC), making it an example of sonata failure. [17] II. Allegro ...
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This particular cadence, V–I, is known as an authentic cadence. However, since a I–V–I progression is repetitive and skips most of the circle of fifths, it is common practice to precede the dominant chord with a suitable predominant chord, such as a IV chord or a ii chord (in major), in order to maintain interest. In this case, the '50s ...