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In jazz, a constant structure is a chord progression consisting of three or more chords of the same type or quality.〔Rawlins, Robert (2005). ''Jazzology: The Encyclopedia of Jazz Theory for All Musicians'', p.131. ISBN 0-634-08678-2.〕 Popularized by pianists Bill Evans and Herbie Hancock, the combination of functional and non-functional chords provides cohesiveness while producing a free and shifting tonal center.〔 For example, the progression Fmaj7-Amaj7-Dmaj7-Gmaj7-C13sus〔 contains four major seventh chords (and one thirteenth chord), none of which are diatonic to the key of F major except the first. In contrast, the vi-ii-V-I or circle progression from classical theory contains four chords of two or three different qualities: major, minor, and possibly a dominant seventh chord; all of which, however, are diatonic to the key. Thus diversity is achieved within a stable and fixed tonal center. ==See also== *Parallel harmony *Side-slipping 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「Constant structure」の詳細全文を読む スポンサード リンク
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