@ShiroKuro The use of earlier popular music was pretty rare in the 1960s era of rock. When the Beatles did it, it was a novelty. It was also at the suggestion of their producer (I forget his name, Brian something) who had long been in the music business and was expert in many styles including classical.
As for the Chopin etudes, I find that most of the contemporary music I play doesn’t utilize the resources of the piano that Chopin and others do: different shadings and colorings that require subtle pedaling changes and careful blending in runs and differing textures.
