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ing to _fall_, the reference being to the falling of the voice (_i.e._, the dropping to the normal pitch) at the close of a sentence. 203. The most frequent cadence in harmony is that involving the chord on I preceded by the chord on V. Because of its directness the cadence V--I is called the _authentic cadence_. 204. The most satisfactory form (to the ear) of the authentic cadence is that in which the highest voice (the soprano) of the final chord is the _root_ of that chord. When the final chord appears in this position the cadence is called _perfect_[36] _authentic_, and when the third or fifth of the chord appear in the soprano, the cadence is called _imperfect authentic_. Fig. 68 shows the chord G--B--D cadencing to C--E--G in three different ways. The first one (a) is called a _perfect authentic cadence_, but the last two (c) and (d) are _imperfect authentic_. [Footnote 36: Many theorists (including Durand in his monumental "Treatise on Harmony") consider the V--I cadence to be the only one which may legitimately be called _perfect_, but the majority of writers seem to take the view that either authentic or plagal cadence may be either perfect or imperfect, depending upon the soprano tone, as noted above.] [Illustration: Fig. 68.] 205. A _plagal cadence_ is one in which the tonic chord is preceded by the sub-dominant chord (IV--I). The _plagal cadence_ (sometimes called the _church cadence_, or _amen cadence_), like the authentic, is described as being _perfect_ when the soprano of the tonic chord is the root of that chord, and _imperfect_ when the soprano of the final chord is the third or fifth of that chord. Fig. 69 shows the chord F--A--C cadencing to C--E--G in three ways. The first one (a) is called a _perfect plagal cadence_, the last two are _imperfect plagal_. [Illustration: Fig. 69.] 206. A _half-cadence_ occurs when the dominant chord is used as the final chord of a phrase, and is immediately preceded by the tonic chord. This form is used to give variety in the course of a composition, but is not available at the end because it does not give a definite close in the tonic key. Fig. 70 shows the use of the _half-cadence_ at the close of such a phrase. [Illustration: Fig. 70. BACH] 207. A _deceptive cadence_ is the progression of the dominant chord to some other chord than the tonic, the word _deceptive_ implying that the ear expects to hear V resolve to I and is deceived whe
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