What are the most technically demanding piano pieces?

1. "Islamey" by Mily Balakirev: Known for its extreme difficulty, it challenges pianists with rapid finger work and complex rhythms.

2. "La Campanella" by Franz Liszt: This piece is famous for its high jumps and fast passages, requiring exceptional dexterity and precision.

3. "Gaspard de la Nuit" by Maurice Ravel: Especially the movement "Scarbo," this piece is notorious for its technical and interpretative demands, with rapid changes and intricate passages.

4. "Opus clavicembalisticum" by Kaikhosru Shapurji Sorabji: Known for its extreme length and complexity, this piece is rarely performed due to its daunting technical challenges.

5. "Etudes" by György Ligeti: These modern etudes are extremely demanding, both technically and musically, requiring advanced skills and deep understanding.

6. "Transcendental Etudes" by Franz Liszt: A set of twelve etudes that are some of the most difficult works in the piano repertoire, each requiring virtuosic technique.

7. "Piano Sonata No. 2" by Charles-Valentin Alkan: Known for its technical challenges, it pushes the pianist's endurance and technical capabilities to the limit.

8. "Three Movements from Petrushka" by Igor Stravinsky: This work is technically demanding with its rapid finger work, wide leaps, and complex rhythms.

9. "Hammerklavier Sonata" (Sonata No. 29, Op. 106) by Ludwig van Beethoven: One of Beethoven's most difficult sonatas, it demands great technical prowess and interpretive skill.

10. "Godowsky's Studies on Chopin's Etudes": These studies are among the most challenging works ever written for piano, often considered unplayable by many.