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Terzschritt
In music theory, ''Terzschritt'' (De: third step) is a dualistic major third relationship, in which the ascending progression from a major tonic triad to major mediant triad is equivalent to the descending one between a major tonic triad and a flat subdominant minor triad. The major chord on the mediant is itself the ''Terzklang'' (De: third chord).
"'Where is the E major chord in C major?'...a ''Terzschritt'' from the tonic....'What is the E major triad in C major?'...a ''Terzklang''....'How does the E major triad make sense in C major?'...it functions either as III+...or as (D )(SP)."〔Kopp, David (2006). ''Chromatic Transformations in Nineteenth-Century Music'', p.99n98. ISBN 0-521-02849-3.〕
In the work of Hugo Riemann (1849-1919), inversionally related chord progressions are grouped together: the progressions C major->E major and C minor->Ab minor belong to the same category: "Terzschritt" (see counter parallel). The first of these moves a major triad up by major third, while the second moves a minor triad down by major third, with the switch from ascending to descending motion accompanying the change from major to minor. In the context of neo-Riemannian theory, this transformation is called "L-then-P". The basic transformations of neo-Riemannian theory, discussed below, all associate changes in direction with the switch from major to minor.
==Sources==
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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