The relationship between performer and musical work has shifted focus in the last fifty years.
Juan Sebastián Lach Lau
Dissonance curves are the starting point for an investigation into a psychoacoustically informed harmony. Its main hypothesis is that harmony consists of two independent but intertwined aspects operating simultaneously, namely proportionality and linear pitch distance.
In the second half of the 20th century, historical informed performance practice became the leading way in rendering “early” organ music. In advance to this development a so called modern approach had been presented, documented with “almost authentic Bach playing á la Straube” by Straube's student Käte van Tricht in her 1945 to 1992 recordings.
So-called "extended techniques" have suffered a consistent lack of understanding from a theoretical, historical and practical point of view.