Godowsky's studies on Chopin,maybe. Sorabij:100 trascendental studies are very difficult, Cziffra transcriptions(from Strauss' Trisch Trasch polka), Horowitz transcriptions(Carmen variations,Star and stripes forever available on Pellisorius Editions) Brahms(Paganini Variations) I don't know. The difficult is all in your mind,I think... "Barney Gumble" <[log in to unmask]>