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Retrograde inversion is a musical term that literally means "backwards and upside down": "The inverse of the series is sounded in reverse order."〔Benward & Saker (2003). ''Music: In Theory and Practice'', Vol. I, p.310. Seventh Edition. ISBN 978-0-07-294262-0.〕 This is a technique used in music, specifically in twelve-tone technique, where the inversion and retrograde techniques are performed on the same tone row successively, "()he inversion of the prime series in reverse order from last pitch to first."〔Benward & Saker (2003), p.359.〕 Conventionally, inversion is carried out first, and the inverted form is then taken backward to form the retrograde inversion, so that the untransposed retrograde inversion ends with the pitch that began the prime form of the series. In his late twelve-tone works, however, Igor Stravinsky preferred the opposite order, so that his row charts use inverse retrograde (IR) forms for his source sets, instead of retrograde inversions (RI), although he sometimes labeled them RI in his sketches.〔Paul Schuyler Phillips, "The Enigma of 'Variations': A Study of Stravinsky's Final Work for Orchestra", ''Music Analysis'' 3, no. 1 (March 1984): 69–89. Citation on p. 70, and p. 88, n. 6.〕 For example, the forms of the row from ''Requiem Canticles'' are as follows: P0: R0: I0: RI0: IR0: Note that IR is a transposition of RI, the pitch class between the last pitches of P and I above RI. ==Sources== 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「Retrograde inversion」の詳細全文を読む スポンサード リンク
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