I am near the end of Book 2 of Guy Lacour's 50 etudes faciles et progressives, and I now wonder what to tackle next. I would prefer 20th-century music. Two possibilities are the Karg-Elert caprices (some of them, anyway) and the Twenty Modern Studies by James Rae. I have enough 19th-century music, and anything before that I prefer to listen to.
Does anyone have any suggestions?