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The augmented seventh chord , or seventh augmented fifth chord,〔 Kroepel, Bob (1993). ''Mel Bay Creative Keyboard's Deluxe Encyclopedia of Piano Chords: A Complete Study of Chords and How to Use Them'', p.15. ISBN 0-87166-579-4. 〕 or seventh sharp five chord is a dominant seventh chord consisting of an augmented triad with a minor seventh.〔"The Dominant with a Raised 5th", Kostka, Stefan, and Dorothy Payne. 2004. ''Tonal Harmony with an Introduction to Twentieth-Century Music''. 6th Ed. pp. 446-447. New York. ISBN 978-0-07-332713-6.〕 Thus, it consists of a root, major third, augmented fifth, and the minor seventh.〔 Garner, Robert (2007). ''Mel Bay presents Essential Music Theory for Electric Bass'', p.69. ISBN 0-7866-7736-8. 〕 Thus in the key of C major it would be C, E, G-sharp, and B-flat as in the figure. It may be notated with the chord symbols C+7, Caug7,〔 or C75, and can be represented by the integer notation . The root is the only optional note in an augmented seventh chord, the fifth being required because it is raised.〔Latarski, Don (1991). ''An Introduction to Chord Theory'', p.29. ISBN 0-7692-0955-6.〕 This alteration is useful in the major mode because the raised 5th creates a leading tone to the 3rd of the tonic triad.〔 See also dominant. In rock parlance, the term ''Augmented seventh chord'' is sometimes confusingly and erroneously used to refer to the so-called "Hendrix chord", a 79 chord which contains the interval of an augmented ninth but not an augmented fifth.〔(Radio: "Shiver down the backbone - Jimi Hendrix comes to Radio 3" ), ''The Spectator'', by Kate Chisholm, Wednesday, 21 November 2007〕 The augmented minor seventh chord may be considered an altered dominant seventh and may use the whole-tone scale, as may the dominant seventh flat five chord.〔Berle, Annie (1996). ''Contemporary Theory And Harmony'', p.100. ISBN 0-8256-1499-6.〕 See chord scale system. The augmented seventh chord normally resolves to the chord a perfect fifth below,〔Bay, William (1994). ''Mel Bay Complete Jazz Sax Book'', p.64. ISBN 0-7866-0229-5.〕 thus G7+5 resolves to a C major chord, for example. ==Augmented seventh chord table== 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「augmented seventh chord」の詳細全文を読む スポンサード リンク
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