Editing Cadence (section)

====Plagal half cadence====
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 [[Inverted chord|inversion]], a descending fifth).<ref>{{cite book|last=Harrison|first=Daniel|author-link=Daniel Harrison (musicologist)|title=Harmonic Function in Chromatic Music: A Renewed Dualist Theory and an Account of Its Precedents|date=1994|publisher=University of Chicago Press|isbn=0226318087|page=29|url=https://books.google.com/books?id=_SyNx1vr-AkC}}</ref> The plagal half cadence is a weak cadence, ordinarily at the ending of an [[Antecedent (music)|antecedent]] phrase, after which a [[Consequent (music)|consequent]] phrase commences. One example of this use is in "[[Auld Lang Syne]]". But in one very unusual occurrence – the end of the [[exposition (music)|exposition]] of the first movement of [[Johannes Brahms|Brahms]]' [[Clarinet Trio (Brahms)|Clarinet Trio, Op. 114]]—it is used to complete not just a musical phrase but an entire section of a movement.<ref>{{cite journal|last1=Notley|first1=Margaret|title=Plagal Harmony as Other: Asymmetrical Dualism and Instrumental Music by Brahms|journal=[[The Journal of Musicology]]|date=2005|volume=22|issue=1|pages=114–130|doi=10.1525/jm.2005.22.1.90}}</ref>