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In music, I–IV–V–I or IV-V-I is a common chord progression and cadence that, "unequivocally defines the point of origin and the total system, the key."〔Jonas, Oswald (1982). ''Introduction to the Theory of Heinrich Schenker'' (1934: ''Das Wesen des musikalischen Kunstwerks: Eine Einführung in Die Lehre Heinrich Schenkers''), p.23. Trans. John Rothgeb. ISBN 0-582-28227-6.〕 Composers often begin pieces with this progression as an exposition of the tonality:〔 It may be viewed as an abbreviated circle progression: I-IV- V-I = I–IV–V–I "Along with motion toward the fifth (V), IV (subdominant ) appears as a corrective, depriving V (the dominant) of its independence and pointing it back in the direction of its origin ()."〔 In the key of C, IV provides the note F and eliminates the possibility of G major, which requires F.〔 The progression is also often used at the end of works and sections.〔 ==See also== *Predominant chord *Three-chord song *V-IV-I turnaround *ii-V-I turnaround *Ragtime progression 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「I–IV–V–I」の詳細全文を読む スポンサード リンク
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