Chopin, Prelude Opus 28 #24
Unforgiving, is the last 3 notes. The knells of death.
Also, for this piece to shine, you need a bright piano. Each note is strong as steel. Feel the unforgiving twang of the steel. Mellow Steinway can go home.
Martha Argerich is the best interpreter of this piece. Chopin Prelude Op. 28 Martha Argerich
Compare to Liszt Transcendental Etude #12