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The Petrushka chord is a recurring polytonic device used in Igor Stravinsky's ballet ''Petrushka'' and in later music. These two major triads, C major and F# major - a tritone apart - clash, "horribly with each other," when sounded together and create a dissonant chord.〔Pogue, David (1997). ''Classical Music for Dummies'', p.80. ISBN 0-7645-5009-8〕 ==Structure== The Petrushka chord is defined as two simultaneous major triads (0 4 7) separated by a tritone (0 6). In ''Petrushka'' Stravinsky used C major on top of F major (the latter presented here in first inversion): 180px 18px Listen to this segment (MIDI file) The device uses tones that, together, make up a synthetic hexatonic scale (0 1 4 6 7 t). When enharmonically spelled C D E G G() B, it is called the tritone scale.〔Busby, Paul. ("Short Scales" ), ''(Scored Changes: Tutorials )''.〕 Alternatively, when spelled C D E F G B it can be read as the auxiliary diminished scale.〔Campbell, Gary (2001). ''Triad Pairs for Jazz: Practice and Application for the Jazz Improvisor'', p.126. ISBN 0-7579-0357-6.〕 It may also be categorized as a lydian dominant♭9 omit 13 scale. The chords may be considered to contradict each other because of the tritone relationship: "Any tendency for a tonality to emerge may be avoided by introducing a note three whole tones distant from the key note of that tonality."〔 〕 At the end of the third tableau the Petrushka chord appears with Petrushka but at A and E, which, with C and F, create a diminished seventh chord (0 3 6 9) and exhaust the octatonic scale (9 1 4, 3 7 t, 0 4 7, and 6 t 1 = 0 1 3 4 6 7 9 t), "and suggests that it did...possess for Stravinsky an a priori conceptual status".〔Taruskin 1987, p.268.〕 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「Petrushka chord」の詳細全文を読む スポンサード リンク
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