Chopin Etude op. 10 no. 12 (Revolutionary) | Marco Vitaliti

Also known as "Étude on the Bombardment of Warsaw", it's reported Chopin composed this after Poland's failed revolution against Russia.
Anyway, what I actually find revolutionary about this one it's the fact this is the only etude in op. 10 which is mostly focused on left hand and is actually technically demanding (yeah, not considering no. 9 😛).