Liszt Transcendental Etude #12
Inescapable darkness and gloom. Each note is a knifing on your heart. It repeats, over and over, with greater intensity and sternness. Forces of nature in execution sans mercy.
Jorge Bolet is the best interpretater of Liszt's transcendental etudes. Plain precision is the key, emotion be ban'd.
For more about this piece, see: Piano Scale Practice; Liszt Transcendental Etude #12.