Lana Kim: World's Most Difficult Classical Piano Pieces (2011)
This is "heavy" piano virtuoso music for those into the most difficult music ever written by those who were the world's formost experts. It is fast, furious, written in impossible keys, and easier only if you have 14 fingers on each of your three hand.
Recommended if you like
Artur Rubenstien,
Evgeny Kissin,
Vladimir Horowitz.